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. 1917 Excerpt: ...from argentiferous solutions before all except those sulphides. A search for pseudomorphs after copper sulphides, sphalerite, and pyrite has shown surprisingly few clearly defined examples, although it probably does replace these sulphides metasomatically. If sulphuric acid should in its descent encounter a soluble ...
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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. 1917 Excerpt: ...from argentiferous solutions before all except those sulphides. A search for pseudomorphs after copper sulphides, sphalerite, and pyrite has shown surprisingly few clearly defined examples, although it probably does replace these sulphides metasomatically. If sulphuric acid should in its descent encounter a soluble sulphide like zinc blende, hydrogen sulphide and zinc sulphate might be formed. The hydrogen sulphide would precipitate silver sulphide from a solution containing Ag2S04. The precipitation of argentite from silver sulphate solution does not necessitate a change in valence like that which takes place when chalcocite is formed. Argentite could be precipitated in any of the following reactions: H2S]Ag2S04=H2S04+Ag2S. ZnS+Ag2S04=ZnS04+Ag2S. PbS+Ag2S04=PbS04+Ag2S. The concentration of silver in weathering galena is discussed on page 57. Pyrargyrite, dark ruby silver, 3Ag2S.Sb2S3, is probably the most valuable secondary silver mineral in a large number of silver mines in the United States. So far as known, it is confined to epigenetic deposits, and it is particularly conspicuous in many deposits of early and middle Tertiary age in the American Cordillera. It is not known as a primary mineral of contact-metamorphic and nearly related deposits. In the Granite-Bimetallic mine, at Philipsburg, Mont., pyrargyrite is perhaps the most important mineral.2 It occurs as small specks intimately intergrown with quartz and stibnite that may possibly be primary, but it is very much more abundant as a secondary mineral in this mine. Crystals as large as cherries line vugs, but most of it occurs in small veinlets that cut across the banding of the primary ore, in which stibnite is abundant. At Tonopah, New, pyrargyrite coats crevices that cut the primary ore and is ev...
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Add this copy of The Enrichment of Ore Deposits (Geological Survey to cart. $16.07, Sold by Zubal Books rated 4.0 out of 5 stars, ships from Cleveland, OH, UNITED STATES, published 1917 by Washington: GPO.
Edition:
1917, Washington: GPO
Paperback
Details:
Publisher:
Washington: GPO
Published:
1917
Language:
English
Alibris ID:
17763502463
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Add this copy of The Enrichment of Ore Deposits to cart. $68.53, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2015 by Palala Press.