Bulletin of the United States National Museum Volume 40-42
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ...Lauder County, Nevada. (15133.) (3) Well crystallized, in quartz, showing also a few small crystals of stephanite. North Star Mine, Reese River district, Lander County, Nevada. (65369.) (4) Crystalli/.eil and granular, in quartz, with other sulphides. Coinargo Mine, Reese River district, Lander County, Nevada. (15156.) (5) Crystallized and granular, in quartz, with other sulphides. Allison Mine, Carson district, Owyhee County, Idaho. (14806.) (6) Intimately mixed with galena and bleude, with a little quartz. Legai Tender Mine, Prickly Pear district, Jefferson County, Montana. (11156.) PROUSTITE. (RUBY SILVER, ARSENICAL SILVER ORE, LIGHT-RED SILVER ORE.) Composition: Ag, AsS; or 3Ag2S+ASiS3. Sulph-arsenide of silver, containing silver (35.5 per cent., arsenic 15.1 per cent., and sulphur 19.4 per cent. It crystallizes in the rhombohedral system, and also occurs massive. It varies in hardness from 2 to 2.5 and in specific gravity from 5.42 to 5.56, is cochineal-red iu color, transparent, and has an adamantine luster. An interesting and important silver mineral, being found frequently with stephauite and pyrargyrite, and like them being difficult to reduce. HESSITE. (TELLURIC SILVER.) Composition: Ag2Te. Telluride of silver, containing silver 62.8 per cent, and tellurium 37.2 per cent. It crystallizes in the orthorhombic system and occurs also massive. It varies in hardness from 2 to 3.5 aud in specific gravity from 8.3 to 8.6, has a lead-gray color and metallic luster, aud can be readily cut with a knife. An important silver mineral in a number of Colorado mines. TETRAHEDRITE. (FAHLERZ, GRAY COPPER ORE.) Composition: CuBSbiS7 or 4Cu2S+Sb2S3, with part of the copper replaced by iron, zinc, mercury, or silver and part of the autimouy by arsenic..
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