Arizona republican., 1909-02-25

phate, Whlcn constitutes tne greater bulk of the deposit.
 TOPAZ. Specimens of this gem were sent to the Arizona School of Mines from MT. J. Grady of Globe. They were yellowish in tint, but no information regarding their exact locality was ob tained.
 White, colorless specimens were also received from W. A. Neal Dec. 1904; locality not disclosed. ToURMALINE.
 A complex siIieate, known also as "SchorI."
 mineral occurs in considerable quan- tity in quartz veins traversing granite fin the hills east of Oracle.
 TROlLITE. Magnetic iron -sulphide, pyrrhotite, in part A sulphide of iron often containing a little nickel or cobalt, occurring in the midst of masses of meteoric iron. Theoretic composition nearly sulphur 9s.2, iron sos. Found in the meteoric irons of Canyon Diablo in nodular masses of various sizes which, by their oxidation, cause eIfoliation with formations of scales of limonite, finally leaving pits and cavities on and in the irons, which. last, may be. regarded as residual masses weathered out from much larger masses. From this point of view it is easy to explain the origin of so many fragments of angular iron with continent pitted surfaces. the original mass probably was chiefly troilite holding irregular masses of iron throughout Its mass.
 TREMoLiTE.
 SiIicate of calcium and magnesium.
 A variety of amphibole. Occurs usually as a result of contact meta morphium.
 TRONA.
 Carbonate of sodai sodium carbon ate, carbon dioxide 3S.s, soda 412,. water 19.e.
 with continent pitted surfaces. The Arizona, but abundantly in Sonora on the shores Of the gulf not far south
 Not known to occur in quantity in
 TUNGsTlTE.
 Tungstic ocher; tungsten trioSide; oxygen POT. tungsten 79.3.
 A yellow pulverulent and earthly mineral accompanying some of the outcrops of wolframite and hubnerite in the Gigas district, Pima county. as a result of the oxidation of those minerals.
 TURouoIs.
 Hydrous phosphate of aluminium; colored by from about to s per cent copper oxide in specimens from diff ferent localities. An analysis by Clarke (Am. Jour. Sci., 1SS6). of a dark green stone from New Mexico gave:
 Phosphorus pento1ide. P2 O5; 2s.63.
 Aluminium. Al2 03; S7.Ss.
 Water. H2 O; 1s.4s.
 Copper oxide, Gu O; 6.56.
 Ferric iron, Fe2 O3; 4.07.
 Silica. Si OF; 4.20
 There are several important locali- ties in Arizona and in the adjoining territory of New Mexico, most of which derive greater interest from the fact that they were worked in | prehistoric times by the aboriginal people, to whom the stone was known 1 as Chalchuits, and is so known today | by the Indians. See Chalchuite. It occurs in Mineral Park. Mohave | county, and in the Turquois district | Gleason, Cochise county. Also twelve miles east of Morris | town, and about seventy miles south | east from Wickenburg. Not much de- | veloped but there are evidences of | aboriginal occupation. (Hammer)
 VANADINITE.
 Vanadate of lead, vsnadium pent- | oxide 19.4. lead protoxide 7s.7. chlorins 2.5.
 Occurs at numerous places in asso- citation with galenite and other ores of lead.
 In heavy incrusting masses of yell Jewish brown crystals in a patented | claim near the Silver Belt mine, Big Bug. Yavapai county.
 Found also in the Black Prince mine, Pioneer mining district. Pinal Arizona, in brilliant red and yellow hexagonal crystals.
 According to F. H. Blake, who found this occurrence and reported on 1t in 1864. (Am. Jour. Sci. Vol. XXVIII). the crystals occur in the seams of partly decomposed rock re- sembling trap, covering completely in some cases five square inches of sur face They vary in size from one sixty fourth to one eighth of an inch In diameter, sometimes reaching the length of one-quarter of an inch. They are often implanted by the side and are then doubly terminated. The ma jority of these crystals are of a deep red color; some vary from a red at one end through deepining shades of delicate straw-yellow to orange and red at the other end. Others exhibit a succession of layers of deep red and light yellow parallel to the basal plane. Many of the crystals are cav ernous, and fibrous, resembling in their cavernous structure the prisms of pyromorphite. The prismatic planes IT. are straiated vertically, which in this rspect Is just the opposite to what occurs in pyromorphite
 The simple hexagonal prism, with put notifications, predominates as the crystalline form; although in some groups of crystals is found the com oination of the two prisms ''P' and -2, with the basal edges replaced by planes of the pyramid of the first series. These planes are very minute. He was unable to find planes between 70" and i-2.
 Wulfenite is also found in this mine put not in very perfect crystals.
 Vanadinite occurs also near Fair banks, Cochise county. (McGee 1903.)