bluuebunny/crossref_metadata_2025_split huggingface dataset:
VI.—Note on “Doubtful Minerals”
Authors: Readwin T. A. 
Published: December 2006

There are found scattered up and down our Mineralogical and other literature, a great many names of Minerals which do not appear to have been satisfactorily determined, or of which very little is actually known.Many of these minerals have been called Doubtful. The following list, I hope, will be inserted in the Magazine, so that the members of the Mineralogical Society and others interested may be able to supply more definite information concerning them.Obviously, it is not my object to impugn the general accuracy of any of the authorities appearing in this long list; but the accumulation of the most reliable mineralogical data attainable, and the focusiug of it, so to speak, where it may be seen by anybody interested.
VII.—“Analysis of Stilbite of an unusual form, from Faröe”
Authors: Heddle  
Published: December 2006

At the foot of the terminal and almost inaccessible cliff of the hill—name unknown—which towers immediately to the south west of the harbour of Waii or Hoiwig, in Bordöe, Faröe, the writer obtained the specimen—a single one—of which the following is an analysis:The island of Bordöe, like the most of Faröe, is built up of strata of bedded trap with mural cliffs, which alternate with terraces of grass clad debris. At this part of the island, the terraced trap consists of a wackenitic “claystone,” which is very friable, light in colour, easily disintegrated, and in places tufaceous in aspect. Its amygdaloidal druses are very few and far between.
VI.—Notes on Vauquelinite from Scotland, and Cantonite from Cornwall
Authors: Davies Thos. 
Published: December 2006

Whilst detaching a small crystal of leadhillite for examination with the polariseope, from a specimen brought from the Leadhills, Lanarkshire, which came into my possession some years ago, I observed one side of the mass to be more or less encrusted with a thin drusy coating, which, from its hardness and streak, I was led to suspect might be either the above species, or Laxmannite, described in 1868 by Nordenskiöld in the Journ. f. prakt, chem. of that year.The bulk of the specimen consists of massive greenish pyromorphito mingled with cerussite, upon this occurs the vauquelinite. The remaining minerals are lanarkite, leadhillite, caledonite in tufts of minute acicular crystals, massive black eerussite and quartz.
VIII.—Further notes on the Oxides of Iron, enclosed in Quartz, at Mwyndy, Glamorganshire
Authors: Vivian Wm. 
Published: December 2006

Since my communication on this subject published in the first number of the Mineralogical Magazine, I have made further observations, and have found other specimens greatly varying, but all embodying the same general principle of solid quartz enclosing the oxides of iron.The quartz is perfectly solid, breaking with its usual eonchoidal fracture, and though richly colored with the oxides of iron disseminated through it in beautiful forms, is itself transparent, so that the forms and colors of the iron are well seen. The colors are various shades of red, yellow, amber, grey, &c., and [hose colors are distributed in well-defined forms, and not in mere tints as in the case of amethyst, &c.
IX.—Notes on the Occurrence of Chlorite among the Lower Silurian Volcanic Rocks of the English Lake District
Authors: Clifton Ward J. 
Published: December 2006

The Volcanic Rocks of Lower Silurian age in the Lake District are interesting in the highest degree on many accounts, and not least so on that of the extreme metamorphism which they have undergone, partly by the deep burial they suffered during the period between the close of the Lower Silurian and the Old Red, when they were once more largely uncovered, and partly by that neverceasing action of infiltration, decomposition, solution and replacement to which all rocks are subject during the course of geological time, but to which rocks of an originally volcanic origin seem specially subject.If there is one feature in this metamorphism of the Cumberland rocks more prorainent than another, it is the large degree to which chlorite has been developed among them, and the universality of its occurrence.
XI.—Notes on some North American Pyrrhotites, and other Minerals containing Nickel
Authors: How Henry 
Published: December 2006

It is a well-known fact that Pyrrhotite, or Magnetic Iron Pryrites, frequently, if not invariably, contains nickel, generally with cobalt in various proportions, amounting together from traces, up to nearly six per cent., and that most of the nickel of commerce is derived from this mineralThe following notes contain in the first place the results of the examination of a few varieties of pyrrhotite, occurring in Nova Scotia, New Brunswick, and the United States, chiefly with reference to presence or amount of nickel and cobalt, and they shew also that remarkable differences exist in the intensity of the magnetism displayed, which ranges from distinct polarity in the mass, down to very iceble attraction by a magnet in the finely powdered state of the mineral, and further, that the most feebly magnetic of the specimens examined is that containing the largest per centage of nickel. The subsequent notes relate to other species from h~ova Scotia and Newfoundland.
Address, &c.
Authors: Sorby H. C. 
Published: December 2006

In commencing the proceedings of the second Annual Meeting of the Mineralogical Society of Great Britain and Ireland, allow me to express the pleasure which it gives me to be present here to-day, and my regret that I was not able to attend the first meeting last year at Glasgow. I feel it to be incumbent on me to give some opening address, but at the same time it must not be long, since many other subjects claim attention.In the first place I think I may well congratulate the Society on its present condition, and contrast it with some of the predictions made little more than a year ago. We were told by men well-known in the mineralogical world that no such Society as our own could possibly be established—that, even if it could, it would be of no use, unless it published a Journal—which it most certainly never could afford.
I.—On the Microscopic Structure of Luxullianité
Authors: Bonney T. G. 
Published: December 2006

So far as I am aware no account of the microscopic structure of this rare and beautiful rock has yet been published. I have, therefore, thought that a brief description of its structure and some considerations concerning the origin of tourmaline rocks may be of interest to petrologists.Boulders of the rock, as is well known, are abundant in the vicinity of the village of Luxullian (about five miles from the town of St. Austell, Cornwall), where I collected specimens in tho autumn of 1873; but I believe the rock itself has never been discovered in situ, though veins of different varieties of tourmaline rock are abundant in the granite of this and other districts in Cornwall, some of which occasionally rather resemble it, and the mineral frequently occurs in the granite itself, the felsite cleans, and the altered sedimentary rocks.
II.—Note on the Serpentine of Duporth, in St. Austell Bay, Cornwall
Authors: Collins J. H. 
Published: December 2006

The Geological Survey Map of CornwalI shews, to the south of the town of St. Austell, several patches of “greenstone,” extending from near the ancient earthwork called Trethullan Castle, on the west, to the sea at St. Austell Bay in the east ; a distance of over four miles.The western end of the most extensive of these patches swells ont on the top of the hill to the north-east of St. Mewan Church, so as to cover several hundred acres (including some of the best land in the parish). This was described by Mr. J. Arthur Phillips some years since in the Philosophical Magazine. Mr. Phillips speaks of the rock as being distinctly crystalline, consisting of felspar (sometimes triclinic) ; semi-transparent yellowish-brown crystals, probably hornblende ; a green fibrous mineral also believed to be a variety of hornblende ; many black grains of oxide of iron and a few hexagonal crystals, probably apatite ; and he says the rock exhibits unmistakeable evidence of extensive alteration. Speaking of its extension eastward, he says “it extends in diminished proportions in a southeasterly direction to the sea at Duporth.”
III.—Note on Duporthite, a new Asbestiform Mineral
Authors: Collins J. H. 
Published: December 2006

This mineral occurs in fibrous masses occupying fissures or shrinkage cracks in the serpentine of Duporth, near St. Austell, Cornwall. The thickest veins I have seen are not more than 1 1/2 inches. The fibres are placed transversely across the vein, making generally an angle with the walls of about 70°, so that the crystallization is probably oblique.The mineral is greenish to brownish gray, has a silky lustre, H about 2 and Sp. Gr. 2.78 : insoluble in HCl, but the iron and magnesia are slowly dissolved out.Thin fibres are flexible like asbestos. Heated in a matrass the mineral gives off a little water, and becomes lighter coloured ; in forceps thin fibres fuse to a dark glass in the hottest part of the flame. The spectroscope shews the sodium and calcium lines distinctly, but no trace of potassium or lithium.
III.—On Bowlingite, a new Scottish Mineral
Authors: Hannay J. B. 
Published: December 2006

In a recently exposed part of a quarry at Bowling, on the Clyde, my friend Mr. John Young, F.G.S., noticed a vein from an inch and half to half an inch in thickness, of a deep green mineral having the hardness and peculiar feeling of stealite, and having secured a good sample he forwarded it to me for analysis. It occurs filling a clean sided fisure on the north side of the quarry. The rock is described by Mr. Samuel Allport, F.G.S., as follows :-“At Bowling, on the North bank of the Clyde, three miles east of Dumbarton, the rock forming the “Hill of Dun,” is a coarse crystalline dolerite, varying in colour from brownish black to black, with distinct crystals of augite, olivine, and felspar diseminated through it. This porphyritic structure is well seen in thin sections. The base is rather finely crystalline and consists of small crystals or grains of the above mentioned constituents, together with numerous grains of magnetite. The large crystals of plagioclase are clear and beautifully striated, they frequently contain glass cavities, and here and there portions, of the base have been enclosed in them . . . . This rock affords excellent examples of serpentinous pseudomorphs after olivine in various stages of formation; the crystalline forms are unusually perfect, and the gradual encroachmeut of the serpentinous matter on the clear olivine may be very well seen. In one of the sections—microscopic—an old fracture has been filled with serpentine, thus forming a vein which traverses some of the large felspar crystals and the surrounding base. A few cavities are also filled with the same substance.”
XII. Further improvements in studying the optical characters of Minerals
Authors: Sorby H. C. 
Published: December 2006

In the following short paper I propose to describe what I have lately done in improving the method of studying the optical characters of the minerals which I treated at greater length in my address last year at annual meeting at Plymouth.It is a curious example of how a method may be invented, and then lost sight of, that the determination of the index of refraction in the way there described was proposed by a French savant upwards of a hundred years ago. I have not yet consulted the original publication, but I very strongly suspect that the proposal was more theoretical than practical, and that with the instruments then at disposal the results were found to be so inexact that the whole system became obsolete and practically forgotten.
XIII. The Geognosy and Mineralogy of Scotland
Authors: Heddle  
Published: December 2006

This lies to the south of Unst ; it is interesting as forming the connecting link which unites the rock masses of Fetlar with those of Unst.Its western extremity is composed of diallagic rocks, containing crystals of that mineral (Hb) very inferior to those of Balta : its middle portion consists of various rocks of the "chloritic series" ; towards the east there is seen a bed of graphitic slate (H) quite similar to, and doubtless the continuation of one which appears near Trista V oe in Fetlar.
XIX. Pilolite, an unrecognised species
Authors: Heddle  
Published: December 2006

One and all of the writers who notice the substance or substances which have received the trivial names of mountain cork and mountain leather, agree in placing them among the fibrous amphiboles, intermediate between asbestus and rock wood.In a monograph of the hornblendes, lately published in the Transactions of the Royal Society of Edinburgh, I have indicated that the above view was probably incorrect ; and having, since that monograph was issued, obtained and analysed several specimens from other localities, I now propose to show that this is a substance distinct from amphibole, and from any any other known mineral.
XX. Crystals of Iron
Authors: Beardsley Amos 
Published: December 2006

At the General Meeting of the Society held at the rooms of the Royal Microscopical Society, King's College, London, on March 14th, 1877, were exhibited some octahedral crystals of iron, which were procured from a hollow cavity in the middle of a bar of pig iron. The way in which they came into my possession was this.A friend was walking on the Docks at Liverpool some years ago, watching a vessel being unloaded, which had arrived freighted with pig iron from Gartsherrie. These pigs were lifted by cranes, and one accidentally slipped, and dropped on to its end, and was fractured in two pieces, showing a cavity about the size of a duck's egg, and his attention was drawn to some bright lustrous objects which he saw roll out of the cavity. These he at once picked up, and found they were crystals of the metal, octahedral in shape, and about ⅗ of an inch in size.
II.―On some specimens of Gabbro from the Pennine Alps
Authors: Bonney T. G. 
Published: December 2006

Some time since Capt. Marshall Hall called our attention to Arolla, in the Pennine Alps, as a locality interesting to mineralogists. I venture, then, to offer you a brief note on one-of its rocks, collected during a visit in the summer of 1875.At the head of the Combe d' Arolla rises the grand mass of the Mount Colon, a truncate cone of precipitous rock, dominating the glaciers of Vuibez and Arolla, which, after sweeping down from the watershed of the Pennine chain, unite into one stream at its base. The highest point of its snowy cap is 12,264 feet above the sea. In the Swiss geological map the greater part of the mountain is coloured as gabbro, and the same rock forms a small peak near the head of the Otemma glacier on the S.W., and the S.W. flank of the Dents de Bertol to the N.E.
VI. On a new Manganesian Garnet
Authors: Heddle M. F. 
Published: December 2006

In the course of an examination of such Scottish garnets as were pure enough for analysis, I found that four had a composition which was very similar, but which differed from that of any known, and that to an extent entitling them to be regarded as constituting a well-marked variety.These garnets, from their purity of colour and transparency, would all be classed as precious garnets–they are, indeed, the most brilliantly coloured which the northern portion of the kingdom affords.
X. Notes on Cornish Mineral Localities
Authors: Collins J. H. 
Published: December 2006

The following brief notes may be of some interest to students of Cornish Mineralogy.1 st.—New Localities.Scheelite.—This occurs as a partial replacement of Wolfram at East Pool Mine, where it was first noticed by Mr. Cornelius Beringer, of Redruth, an Associate Member of this Society. Hitherto it has only been found at Pengelly Croft, Huel Mandlin, and Levant Mine, in Cornwall, and at Huel Friendship, in Devon.
XI. Observations on Crystallogenesis
Authors: von Hauer Carl Ritter 
Published: December 2006

The number of planes is extremely variable in many crystals. Those of the same substance produced under modified conditions, even when issuing from the same solution, are occasionally very different in this respect. Generally the forms become less complicated and the number of planes diminishes, a certain number Of them definitely disappearing, during the crystal's increase in volume. Such transitory planes are very frequently defective in parallelism.Two kinds of planes may be distinguished on crystals of any system ; some which are constant, others which may be termed variable; the latter being occasionally wanting, are in other cases very numerous.
II. The Geognosy and Mineralogy of Scotland
Authors: Heddle  
Published: December 2006

This is a mere fragment of gneissic rocks which is imbedded between the granite of Roeness and the igneous rock which lies to the east : but so different are these entrapped rocks from the ordinary gneiss of Shetland, and so violent a twist do they seem to have received athwart of their normal strike, that the enquiry rises-whence did this fragment come ?A spectator looking west from the top of Ornsfield, gazes seaward upon a mere heap of ruins ; while, looking landward, he also sees little else,-so riven and twisted are the rocks by the intrusion of dykes of porphyry, and so shattered and toppling from the invasion of the sea.
VI. Preliminary Notice of Substances Which may prove to be New Minerals
Authors: Heddle  
Published: December 2006

At Mr. Collins's request I submit to the members of the Mineralogical Society the following preliminary notice of substances which I have collected during" my somewhat extensive wanderings about Scotland.In the case of several of the substances described, it will be seen that I do not by any means bring them forward as being without doubt new minerals; of that, I have not satisfied myself, and still less can I hope to satisfy others, until specimens more fitted for absolute deterrmination are obtained, and that in a quantity larger than what I have as yet had to operate upon.The noting and describing these substances now, will enable others to lend their aid in the work.
II. The Geognosy and Mineralogy of Scotland
Authors: Heddle  
Published: December 2006

“A monotony of external configuration affords” says Geikie, “a good indication of the sameness of the geology”; and a country which is devoid of scenic interest, however well it may in a few cases fill the pockets of the metallurgist, will assuredly never satisfy the cravings of the scientific mineralogist.
A land of diverse formations, gashed by rivers, gouged by glaciers, cleft by faults, and hitched about by slips,—with its mountains never of the same mind as regards the fashion of their contours, tossed hither and thither as if they had been kicking about in chaos,—in such a land, he who would learn from the pages of nature may rest assured that he has much to read.
V. On a new face on crystals of Stilbite, from two localities
Authors: Heddle  
Published: December 2006

Many years ago I observed upon crystals of the red stilbite, which was at one time obtained near Loch Humphrey, and at the Long Cray, in Dumbartonshire, a face which is between r and a of Brooke and Miller.
More lately I have observed a face which also lay in the same position upon the crystals of a specimen ticketted as from Farrugaric-Wuardi, near Mount Nombi, west side of Wellington Plains, Australia.
In none of the specimens which I have, was this face very smooth; and having failed to obtain better, I now note it, though the measurement can be little better than an approximation.
VI. On Portable Chemical Apparatus for Quantitative Mineral Analysis
Authors: Arnold A. E. 
Published: December 2006

Towards the end of the last century one Professor Göttling, who taught chemistry in the schools of Jena, conceived the idea of preparing a portable chest of chemistry, or complete, collection of Chemical Tests. Chemical knowledge being in those days somewhat limited, we are not surprised to find that the contents of the chest could be stowed within a space nine inches square by twelve deep.This cosmopolitan collection was intended for the use of chemists, physicians, mineralogists, scientific artists, manufacturers, farmers, and the cultivators of natural philosophy. The tests were prepared by a Mr. Hunneman, a friend of the author, and pupil of Klaproth and Hermbstaedt of Berlin; and were put up in thirty five glass bottles and some small wooden boxes.
VII. Further Notes on Mineral Growth
Authors: Readwin T. A. 
Published: December 2006

When I read my first paper on “Recent Mineral-growth at ordinary temperatures” under (what we, perhaps, rather carelessly call) “ordinary conditions,” I was met with the reasonable remark that, time enough had not elapsed for me to be certain of my facts.Since then, I have had more than three years of affectionate watching in my “Gold-garden” (as Mr. Ruskin pleasantly calls it); and I am glad to say that the interim has been productive of some new and striking spontaneous changes; which, for convenience of expression, I continue to term “mineral-growth.”I have before me a number of mineralogical facts of much interest, and I propose to notice first, some recent alterations in 47 of the specimens described in the paper referred to; and then to add a few short notes of similar changes in 35 specimens, not therein alluded to.
X. On certain Crystallized products, formed in smelting operations
Authors: Terrill W. 
Published: December 2006

Crystals have often been accidentally produced in the various processes of smelting, having the form and composition, or nearly so, of natural minerals; and have been from time to time described in the scientific journals. Some few, however, which have come under my notice have not been, so far as I am aware, previously described; and as the importance to mineralogy of a due regard to the nature of such crystals, as well as the conditions under which they may have been formed, is beyond question, I avail myself of this opportunity to lay before the Mineralogical Society specimens of the few products to which I allude, and to explain the circumstances of their formation:—Specimen No. 1 contains some dark green crystals of arseniate of copper, resembling in appearance native olivenite. Before the blowpipe on charcoal these crystals melted easily, then, with a sort of deflagration, gave off copious arsenical fumes incrusting the charcoal, and yielded a button of metallic copper.
XVII. On Brochantite and its associations
Authors: Semmons W. 
Published: December 2006

The large series of combinations of copper with sulphuric acid found in mineral veins, present many features which call for attentive study.Some of the series, as Chalcanthite and Pisanite, are easily soluble in water, while others, as Brochantite and the members of the group allied to it, are insoluble therein, and the solubility seems to run in parallel lines with the percentage of copper.The “Basic ” sulphates have of late received considerable notice, and English mineralogists must remember with pleasure that the masterly essay by Prof. Maskelyne “On the minerals of the Brochantite group,” gave us for the first time a clear insight into the characters of some of its constituents. This elaborate, paper shewed that the ortho-rhombic varieties were clearly entitled to be divided into distinct mineral species.
I.―Minerals New to Britain
Authors: Heddle  
Published: December 2006

A number of minerals not before noticed as occurring in Britain have been described, and corroborative analyses thereof have been given, in the papers which I have, from time to time, published in the Transactions of the Royal Society of Edinburgh, and also, though to a smaller extent, in the Mineralogical Magazine.Those which I now bring forward, have been analysed for the most part for a considerable time; but, as it must of necessity be long before I come to notice them, in their proper place, in my “Geognosy of Scotland,” it is well to announce their occurrence without further delay.