Arizona republican., 1909-02-24

District it is the chief gangue or vein-stone. Yuma county
 At the Silver King mine, Pinal county, it occurred massive and in punches and. except quartz, was the most abundant vein-stone but not as closely associated with the silver and rich ore as the quartz.
 Massive, with red streaks, Salt River Valley east of Phoenix Aus tin, Jan. 1905).
 In crystalline aggregates like groups of oysters and popularly known as fossil oysters from the Cababi country west of Tucson.
 BlSMUTHENlNTE.
 Sulphide bismuth, copper and lead. Reported from near Bisbee, Cochise county. (McGowan)
 BISMUTH.
 Blsmuth ore has been found at several places in the territory. As carbonate and oxide, it occurs in the Salt River Valley, where the veins have been prospected by a German company. In combination with tel iurium ('Tetradymite. which see). at the so-called bismuth claims, Min
 
 Ores of bismuth are reported from the Aquarius range in Mohave county
 BOURNONlTE.
 Known, also, as "WheeI- -Orc". Nam- ed for Count Bournon, a mineralogist A sulphide of antimOny lead and cop per. Occurs in well formed charac- teristic brilliant crystals at Murray's claim, Big Bug. Yavapai county, but sparingly. only two good specimens having been obtained by me when the claim was being worked.
 BARNHARDITE.
 An analysis given by Dana of a specimen from Bill Williams Fork shows: Sulphur 2s96, iron 2944. cop per 5O41. It may be a partly altered (See. also Chalcopyrite)
 BORNITE.
 Known also as Peacock ore. purple copper, variegated copper and as erubesite. It is a sulphide of copper and iron, but the percentages of these metals vary. Analysis shows from 22 to 2S per cent of sulphur. 50 to 70 per cent of copper and from about ' to IS of iron. Dana observes that the variation is due in part, at least, to mechanical admixture, chiefly of chal- cocite, a view confirmed by Baum hauer's microscopical examination.
 This valuable ore of copper occurs at many of the Arizona copper mines. and is closely associated with chalco- pyrite, and pyrite. At Leatherwood's claims in the Santa Catalina noun tains it constitutes a large part of the ore. It was found at the Silver King in Pinal county; at Austin's mine Santa Cruz county (Balcom); in the Black Hills in the various mines including the United Verde.
 BROCHANTITE
 The basic sulphate of copper is comparatively rare in nature, though acting an important part in the for nation of secondary copper ores. Be ing soluble in water it is readily washed downward and out of sight. till coming un contact with lime stone, or calcareous rocks, it is de- per carbonate and gypsum.
 The investigations of Lindgren and of the copper ore deposits of Metcalf and Morenci showed the presence of this species in a few places in well developed crystals. This led to a systematic examination of the green colored ores which disclosed the fact that the sulphate is a com- mon associate mostly intergrown with copper carbonate (malachite), which effectively masked it's presence. It occurs as lighter or darker emerald green crusts on limomte or serictized porphyry from the red ore body in the Shannon mine, from the Metcalf mine and other places. Il
 CAlAMlNE.
 SiIicate of Zinc. Silica 25, oxide SIS. Water 0.75. Reported by Lindgren from the garnet rock of the Shannon mine just