bluuebunny/crossref_metadata_2025_split huggingface dataset:
V. Note on Christophite from St. Agnes
Authors: Collins J. H. 
Published: December 2006

About a year since I received from our associate Mr. Alfred Davies, of St. Agnes, a dark-brown mineral which was supposed to consist largely of sulphide of tin. As it differed greatly in appearance from the socalled tin pyrites, I at once felt interested in the supposed new mineral, and commenced an analysis which I have lately been able to complete.It is generally granular in appearance, dark-brown, translucent very slightly on thin edges, infusible B.B,, soluble more or less completely in aqua regia, &c.—in fact its properties differ but little from those of an ordinary dark variety of blende, except that with careful manipulation it yields a bead of tin when treated with reducing agents on charcoal.
XII.–Note on a Crystallised Slag isomorphous with Olivine
Authors: Arnold A. E. , Collins J. H. 
Published: December 2006

The crystals referred to were found in considerable quantity in the slags produced in Mr. Hollwaf's experiments on the reduction of metallic sulphides at Penistone, in July 1878.The experiments were carried out with ordinary Bessemer plant. Upon running the molten mass from the ladle into one of the ingot moulds the slag ran in a thick stream of perfect continuity, falling without noise a distance of some feet into the liquid portion below. The crystals occurred lining cavities in the partially cooled slag from which a portion of the molten material had been withdrawn.
XXII–On Serpentinous Minerals from the Saas Thal and from Scotland
Authors: Marshall-Hall  , Heddle  
Published: December 2006

In a letter to Dr. Heddle, Capt. Marshall Hall writes—" On the next page I give you, in complement of my last letter, the analysis of a serpentine from the Saas Thal. For the specimen I am indebted to M. Henri de Saussure. It will be interesting to compare it on the spot, and study it in its relations to the accompanying rocks and minerals.Whether the stone is fairly serpentine with so much iron is perhaps to be questioned ; I send the analysis as that of a "reputed " serpentine, and I send it to you as you have been doing serpentines, ... . as it is possible that additional data may be of use to you.
VIII. On some Cornish Tin-Stones and Tin-Capels
Authors: Collins J. H. 
Published: December 2006

In my former paper (Min. Mag., vol. IV, page 1) the different modes of occurrence of oxide of tin in Cornwall were briefly described, and the characters both macroscopic and microscopic of the ordinary tin-stones and tin-capels were illustrated in considerable detail. I have now to describe the peculiar varieties of “wood-tin” or Cornish tin-ore, which are certainly characteristic of many of the Cornish deposits, although their occurrence is not limited to Cornwall as was at one time supposed.The chemical composition of Cornish wood-tin differs very little from that of ordinary Cassiterite, as was shown long ago by Klaproth.
XV. The Geognosy and Mineralogy of Scotland
Authors: Heddle  
Published: December 2006

Notwithstanding the very considerable extent of shore-line which the deepest-seated rock exposes to the ocean, it exhibits extremely few illustrations of either cliff, or rocky shore.The rocks which do occur are found to be of an altitude which is altogether trifling,—very much more so than even the great durability of the material of which they are composed would warrant us in expecting. Indeed, from the fact of the shore-line being at right-angles to the strike of the strata, and from these strata being at so high an angle of tilt, we should expect to meet with an almost continuous line of cliff. Instead of this, we find long points of land, of hummocky or undulating contour, running far out into the sea,—a profuse sprinkling of cliffless islets, which resemble in every particular the hummocks of the land,—and long sinuous stretches of water thrusting themselves up into what resemble land-valleys, very much more than sea-bays.
XVI. On the Chemical Composition of Epidote from Quenast
Authors: l'abbé Renard M. 
Published: December 2006

This Epidote is found in the well-known quarries of quartziferous diorite at Quenast.Without entering into any details regarding its crystalline form, it will suffice to mention that it here occurs in bacillary prisms, often elongated in the direction of the orthoaxis, and almost always macled parallel to the cleavage plane . It also occurs frequently in lamellar, fibrous and radiated masses of a pale green color, at times greyish or straw-colored ; these groups of crystals, which frequently occupy the geodes of the matrix, are capable of furnishing the mineral in a state of great purity, and well suited for chemical analysis.
The Geognosy and Mineralogy of Scotland
Authors: Heddle  
Published: December 2006

A Very few dykes of the "greenstone type " are to be seen in the lower gneiss.There are some localities at which the gueiss seems itself to have furnished the material of the dyke, if not to pass into it by insensible gradation.One is a dyke seen in the vicinity of Badnaternag, on the north shore
of Loch Assynt. Here the dyke runs along the strike of the rock.
On the Crystalline Form of Meneghinite
Authors: Miers H. A. 
Published: December 2006

A complete description of this mineral was given in Poggendorf's Annalen, vol. 132 (1867), p. 372, by Prof. vom Rath, who ascribed it to the oblique system with the elements, a : b : c=·361639 : 1 : ·116825 ; β=87°40′18″.This paper gives a full account of the appearance and properties of the Meneghinite from Scrravezza, and of its association with Quartz, Galena, Blends, Chalybite, Copper Pyrites, Iron Pyrites, Calcite, and Albite; the results of the analysis also accord fairly with the previous determinations of Bechi and Hofmann, which give for the formula Pb4 Sb2 S7 or 4Pb S + Sb2 S3.
Notes on a Recent Discovery of "Connellite"
Authors: Semmons W. 
Published: December 2006

The gradual decline in the production of copper from the mines of Cornwall and the consequent diminution of their number renders any discovery of a rare copper mineral an object of interest to all mineralogists.Owing to the exhaustion of all the upper deposits, those products of decomposition—the beautiful arseniates and phosphates, &c. which adorn the cases of our national collection and those of private collections—are getting more and more scarce, and perhaps in the near future, so far as Cornwall is concerned, we shall have to rely for illustrations entirely on its past productions.
On Monazite from Cornwall, and Connellite
Authors: Miers II. A. 
Published: December 2006

A specimen of crystallised quartz and albite has recently been acquired for the British Museum which has a few isolated crystals of this rare mineral dispersed upon it. Conclusive evidence that the specimen comes from Cornwall is supplied both by the appearance of the quartz and albite and by the presence of the clay-slate with which they are associated.The mineral monazite or Turnerite has hitherto been discovered in few localities and never in the British Isles. Anatase, however, is mentioned in Greg and Lettsom (Manual of the Mineralogy of Great Britain and Ireland, p. 363) as occurring at Tintagel and near Liskeard in Cornwall ; and it is just possible that crystals of monazite may have been mistaken for anatase.
Analysis of a Sample of Strontianite from Strontian, Argyllshire
Authors: Ivison Macadam W. 
Published: December 2006

The samples to which this note refers were freshly cut from the quarries at Strontian. The mass differs much in quality, but is largely made up of the usual acicular groups. The colour of the mass as received varied, according to the composition, from a slight green shade where Strontianite predominated, to the more pure white of barium and calcium compounds.The analyses were made from various portions, No. 1 being the selected Strontianite, No. 2 the more white portion of the mass.
Some Occurrences of Actinolite in Scotland
Authors: Peyton W. W. 
Published: December 2006

In this Paper the author directs attention to some localities in Scotland where the aetinolite forms of hornblende are to be found.In Aberdeenshire the actinolite occurs as sheaf-like groups, irregularly distributed through a felspathic base ; also as slender crystals, extending sometimes to the length of eighteen inches, in a dioritic rock. On the hill of Heshgarnich, in Perthshire, this variety of hornblende occurs in nests, also in fan- or sheaf-like bundles of a black colour ; and on the north side of the hill it is found in blade-like forms distributed through a glistening micaceous schist.
On some New Localities for the Mineral Diatomite, with Notes on the Chemical Composition of the Specimens exhibited
Authors: Macadam W. Ivison 
Published: December 2006

In my previous papers on this subject I have detailed various localities in which the mineral Diatomite has been found. Since the dates on which my papers were read various other localities have been discovered for the mineral, and I now beg to lay the details before the Society. The new samples are four in number, and are from—1.—Golspie, Sutherlandshire.2.—Loeh Osabhat, Tolsta, Lewes.3.—Auchnerran, Aberdeenshire.4.—Presswhin, Aberdeenshire.A fifth sample of a nodular mass from the Diatomite of Loch Kinnord, Aberdeenshire, has been analysed, and the results are included in this paper.
On the Analysis of a Sample of Talc Used in Paper-making
Authors: Macadam W. Ivison 
Published: December 2006

The mineral to which this notice refers is obtained from New Jersey. It is very largely employed for paper-making in place of China clay (Kaolin), and gives, amongst other advantages, a much more pure effluent, fully ninety per cent. being retained in the paper. From its fibrous nature it appears to attach itself to the smaller paper particles and retain these also. The very high and beautifully smooth glaze of the American papers is largely due to the use of this substance.The mineral is of a highly fibrous character, almost pure white, perfectly insoluble in water, is greasy to the touch, and readily broken down in the fingers.
Note on the Occurrence of Bismutite in the Transvaal
Authors: Louis Henry 
Published: December 2006

This mineral occurs plentifully, though finely disseminated, in the veins of auriferous quartz in the Lydenburg district of the Transvaal. These veins are often capped by a "gossan" of brown hvematite, crystalline, amorphous, or at times pseudomorphous after iron pyrites; a good deal of similar brown hæmatite occurs also throughout the veins themselves. The Bismutite is disseminated irregularly through the veins, and also occurs in small pockets in the ferruginous gossan; it is from the latter source that the mineral was obtained for the subjoined description and analysis.It is amorphous, pulverulent; colour greenish yellow to lemon-yellow, more rarely brownish yellow; opaque (feebly translucent, with waxy lustre under the microscope); its hardness appears to be about 8, but cannot well be determined on account of its pulverulent character. Specific gravity 6.86.
On the Use of the Gnomonic Projection; with a Projection of the Forms of Red Silver Ore
Authors: Miers H. A. 
Published: December 2006

If the planes of a crystal be replaced by lines drawn perpendicular to them through a point the intersection of the sheaf of lines so formed with the plane of the paper is the Gnomonic Projection of the crystal; each face being represented by a point and each zone by a line joining two such points. This projection, which has been frequently used and fully described, has generally been employed to represent the symmetrical disposition of the faces, the plane of the figure being a plane of symmetry.But the practical value of the projection is best seen when it is used either as a graphic representation of the forms of a mineral, or as a method of drawing a perspective figure of any part of a crystal.
On the Discovery of Leucite in Australia
Authors: Judd J. W. 
Published: December 2006

The mineral Leucite has for so long a period been considered as one of the most remarkable examples of limited distribution both in space and time, that the discovery in Australia of a rock largely composed of this mineral, by Mr. T. W. Edgeworth David, F.G.S., of the Geological Survey of New South Wales, is one that appears deserving of being at once placed upon record.Leucite-crystals, under the head of "white garnet," or "white schorls," appear to have been known from a very early period ; and, indeed, the fine examples from Somma could scarcely fail to attract the attention of the older mineralogists. Subsequently it was found that the mineral occurs in other parts of Italy, and especially the neighbourhood of Rome, as well as at the Laacher See and the Kaiserstuhl.
On the identity of Bruiachite and Fluor
Authors: Forster Heddle M. 
Published: December 2006

Several years ago Dr. Thomas Aitken, of Inverness, put into my hands a mineral which he thought to be new, with the request that I would analyse it.He stated that the mineral occurred in veins in the conglomerate of the Old Red Sandstone, near Loch Bhruithaich, in Inverness-shire ; that it had been found by and given to him by the head gamekeeper on the Lovat property, and that similar pieces had been given to Mr. Wallace.The specimens which he put in my hands, and others which he showed me, consisted of one side of a vein-plug, and were formed of alternate bands of foliated flesh-coloured baryte, with narrower ones of the substance in question.
Notes on Crystallites
Authors: Rutley Frank 
Published: December 2006

The work of tile late Hermann Vogelsang, and the subsequent researches of O. Lehmann and other observers, have done much to show that a careful study of the rudimentary forms of crystallisation may prove as valuable to the mineralogist as that of embryology has already been to the comparative anatomist.It is, indeed, difficult to form any clear conception of the manner in which a crystallite originated, nor can we go further back in the history of its development than a stage in which a number of atoms have been grouped in an arrangement about which there is yet no certainty, thus forming molecules grouped in some manner about which we are equally uncertain. We can but imagine that there is some inherent property in molecules which causes them, under given conditions, to group themselves in an orderly manner and to assume a form which may, when more fully developed, be referred to one of the recognlsed crystallographic systems.
The Optical Indicatrix and the Transmission of Light in Crystals
Authors: Fletcher L. 
Published: December 2006

Fresnel's representation of the laws of transmission of rays of light in biaxal crystals, by reference to the surface distinguished by his nsane, has long been regarded as one of the greatest achievements in the domain of Physical Science. In his memoir on Double Refraction, Fresnel proceeded as follows :—1. He assumed that the transmission of a ray of light is effected by means of an elastic ether vibrating transversely to its direction.To the ether is thus assigned a property not belonging to a perfectly fluid body in a state of rest : perfect fluidity of a body at rest involves incapacity of resistance to mere change of shape, and it is to such distortional resistance that transverse vibrations must be due.
Analysis of Aragonite from Shetland
Authors: Thomson J. Stuart 
Published: December 2006

Few, if any, analyses of British aragonites have been published; that which I now submit was executed upon a specimen forwarded to me by Professor Heddle, who has supplied me with the following notes of its occurrence.It was obtained by him at Sobul Hill, in Unst, Shetland.The west side of the hill of Sobul is pitted for the extent of nearly a mile with quarry holes, opened in a search for chromite.
On the “Skin” of Agates
Authors: Heddle  , Thomson J. Stuart 
Published: December 2006

I believe that the green ' Skin' of Agates will prove to be celadonite and not delessite, as has been generally supposed." This is an extract from a paper by one of us, which was published in 1879 in the Transactions of the Royal Society of Edinburgh.Quarrying for agates upon a large scale having been carried out for several weeks during a succession of years on the shore of Forfarshire, an unusual supply of tile soft coating which frequently invests them was obtained.
Minerals from Swaziland: Niobates and titanates of the rare earths, chemically allied to Euxenite and Fergusonite; Cassiterite, Monazite, etc. The “Æschynite” from Hitterö
Authors: Prior G. T. 
Published: December 2006

The specimens described in this note were collected by Mr. Sydney Ryan, Managing Director of the Ryan Tin Mines, and were presented by him to the British Museum through Mr. John Ballot, who brought them to England.They were found in the stanniferous gravels of the Embabaan district in Swaziland, S. Africa. Their probable source is the granite-gneiss which forms the base of the rock-series in that district.
Ægirine and Riebeckite Anorthoclase Rocks Related to the “Grorudite-Tinguaite” series, from the neighbourhood of Adowa and Axum, Abyssinia
Authors: Prior G. T. 
Published: December 2006

In 1869 the late Dr. Sadebeek gave a brief description of a collection of rocks, accompanied by a map and profiles, made by Dr. W. Sehimper in the neighbourhood of Adowa and Axum, Abyssinia.In the British Museum is a very similar collection, which was purchased from Dr. Schimper about the same time. As some of these rocks showed points of resemblance to the riebeckite-trachytes of Senafé, recently described by the author, a somewhat more detaBed petrographical examination of the specimens than Dr. Sadebeck was able to afford them appeared to promise something of interest.
Sulpharsenites of Lead from the Binnenthal
Authors: Solly R. H. , Jackson H. 
Published: December 2006

The metallic grey minerals which are found in the white saceharoida! dolomite of the Binnenthal have been known ever since the old priest Walpen of Binn and R. yon Ritz began collecting them nearly seventy years ago.The name "binnite" was first given indiscriminately to the grey metallic minerals; afterwards these were subdivided into "Kugel Binnit" and " Stangen Binnit."
Crystallised Stannite from Bolivia. with Plate II
Authors: Spencer L. J. , Prior G. T. 
Published: December 2006

Very little is known of the crystalline form of thc somewhat rare mineral stannite, since in the few localities in which it has been found it usually occurs only in the massive state. Several suggestions, summarised below, have been made as to the type of crystalline symmetry of the mineral, but hitherto no crystals have been completely examined.(1)Orthorhombic. Haüy (1822), from an examination of cleavage fragments from Cornwall, concluded that the primitive form might possibly be a right rhombic prism.(2)Cubic. Haidinger (1825) mentioned Cornish crystals, having apparently the form of regular cubes, but the dulness of the faces did not allow of any measurements. The massive material appeared to show cleavages in the directions of the faces of the cube and rhombie dodecahedron. (Crystals of Cornish stannite are further mentioned on p. 65 below.)
On various minerals (Anatase, &c.), from the Binnenthal
Authors: Solly R. H. 
Published: December 2006

Anatase.—Some very brilliant and highly modified crystals of a light brown colour were obtained from the Ofenhorn in 1908. The largest crystal measures nearly an inch across. The. form {313} is largely developed; other forms present are {100}, {110}, {111}, {331}, {221}, {223}, {835}, {112}, {118}, {117},and also a new {h k l} plane close to (110) and (221), which is probably (24.14.7). These crystals resemble Seligmann's fig. 3.In 1902 some much smaller, dark brown crystals of a different habit, with the form {117} largely developed, were obtained from another part of the Ofenhorn. They resemble Klein's fig. 3. Three new forms were observed, namely {553}, {35.8.5}, and {40.3.5}.
On various masses of meteoric iron reported to have been found in Great Namaqualand and the adjacent region
Authors: Fletcher L. 
Published: December 2006

In November, 1836, Captain (afterwards Sir) James Edward Alexander was at Henkrees (29° S., 18° E.) on the southern side of the Orange River, South-West Africa, and sought for information as to what he might expect to find during his intended journey across Great Namaqualand. He says :—‘A respectable old Bastaard lived at Henkrees, Balli by name; he was the owner of a thousand head of cattle, of many horses and sheep. … He also told me of great quantities of copper far up the Great Fish River, and of hills from which malleable iron could be cut out.
Note on cobaltiferous Mispickel from Sulitjelma, Norway
Authors: Fletcher Mark 
Published: December 2006

Some months ago Professor Henry Louis presented to this college several isolated crystals which he had brought from the Sulitjelma (or Sulitelma) mines in Arctic Norway: they occur there in masses of copper-pyrites and iron-pyrites, for which this district has been famed for some years.The crystals are of various sizes, ranging in length from 4 to 8 mm. They have a metallic lustre and silver-white colour. The fracture is uneven, and no cleavage is visible. On a freshly broken surface small yellow particles can be seen with the naked eye; these also have a metallic lustre, and are probably iron-pyrites, a probability which is strengthened by the appended chemical analysis. The specific gravity varies from 5.94 to 6.02, and the hardness is just under 5. The crystals are all of a pronounced rhombic aspect.
Note on the occurrence of Brookite in the Cleveland ironstone
Authors: Lindsey C. R. 
Published: December 2006

The references to the occurrence of the titanium dioxide minerals as rock constituents have been so recently summarized in the ‘Mineralogical Magazine, that it is unnecessary to repeat them, except to refer again to Mr. J. J. H. Teall's record of anatase in the Cleveland ironstone.Wishing to procure some of these crystals, a pound of ore from the Main Seam at Upleatham mines was treated by the usual processes of solution, washing by decantation, and separation by heavy solution. The residue obtained was equal to 0.16 per cent. of the material taken, and consisted mainly of anatase, mostly in sharply developed pyramidal crystals, with some pyrites in nodular concretions, possibly in replacement of some of the oolitic grains, together with other minerals of derived origin, among which futile and tourmaline were the most prominent.
On Carnotite and an associated mineral complex from South Australia
Authors: Crook T. , Blake G. S. 
Published: December 2006

This paper gives the results of an investigation at the Imperial Institute of a carnotite-bearing specimen received from South Australia.The material represented by the specimen is described by Mr. H. Y. L. Brown, Government Geologist of South Australia, as occurring about 2 miles SSW. of Teesdale's dam and about 20 miles ESE. of Olary railway station. He remarks : ‘The ore occurs as yellow and greenish-yellow incrustations and powder on the faces, joints, and cavities of a lode formation, which consists of magnetic titaniferous iron, magnetite, &c., and quartz in association with black mica (biotite) . . . . . . The outcrops traverse metamorphic gneissic micaceous granite and granite schist, into which dykes of granite and diorite have been intruded.’