This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...Epidote Alunite Water (below 100C.) FeS2 Cu2S SnS MoS, Amesite, MgO: FeO = 6:1. I 0.39 per cent. MgO, 0.19 per cent. H20 residue, with 0.40 per cent. Si02--too high in H20 for serpentine. '0.84 per cent. MgO, 0.29 per cent. FeO, 0.53 per cent. H20 residue, with 1.15 per cent. Si02--too high in H20 for serpentine. II 0 ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...Epidote Alunite Water (below 100C.) FeS2 Cu2S SnS MoS, Amesite, MgO: FeO = 6:1. I 0.39 per cent. MgO, 0.19 per cent. H20 residue, with 0.40 per cent. Si02--too high in H20 for serpentine. '0.84 per cent. MgO, 0.29 per cent. FeO, 0.53 per cent. H20 residue, with 1.15 per cent. Si02--too high in H20 for serpentine. II 0.62 per cent. MgO, 0.39 per cent. H20 residue, with 0.70 per cent. Si02 corresponds fairly well to deweylite. 1.11 per cent. MgO, 0.49 per cent. H20 residue, with 1.12 Si02--too high in H20 for serpentine. '0.89 per cent. MgO, 0.95 per cent. H2O residue, with 0.87 per cent. Si02--too high in HjO for serpentine. Si Al20: Fe20, =4:1. adjoining a 2-inch pyrite vein--a soft white chalky rock containing scattered pyrite and showing on a few seams a little chalcocite. The locality where this specimen was obtained is 600 feet below the surface and somewhat below the main chalcocite zone, although there is a little oxidation and chalcocitization of the vein. The rock is a felted mass of sericite with some granular quartz and is cut by veinlets of kaolin. Pyrite is present in grains and crystals. Zinc blende, chalcopyrite, and molybdenite occur in small amounts as irregular grains and aggregates; also some rutile and zircon. Sample 3, taken about 300 feet below the surface, is a hard white porphyry with small pyrite crystals. The original structure is almost lost, but under the microscope the outlines of feldspar crystals are visible. The rock consists chiefly of a very fine sericite felt with granular quartz; the quartz also occurs as veinlets with pyrite. Sample 4, the disseminated chalcocite ore, is a soft white chalky rock, cut by many small seams of pyrite and chalcopyrite. In thin section the porphyry structure is retained, but the feldspars are en..
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Add this copy of General Economic Geology: a Textbook to cart. $70.00, very good condition, Sold by Faith In Print Books rated 4.0 out of 5 stars, ships from Cumming, GA, UNITED STATES, published 1922 by McGraw-Hill Book Company.
