Bulletin - Illinois State Geological Survey
Bulletin - Illinois State Geological Survey
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Buckley and Buehler,^^ however, have shown that lead, zinc, and iron sulphides precipitated from neutral'^ solutions are thrown down in an intimate mixture. Further, lead and zinc sulphides are thrown down from alkaline solutions when precipitated by the neutralization or dilu- tion of their solutions, or by the action of hydrogen sulphide upon them.
Hence the formation of pure crystals of galena by this theory would in- volve a primary concentration of mixed sulphides and a later segrega- tion..., either by the leaching out of the more soluble zinc and iron sulphides or by the solution of the whole and the reprecipitation of the galena by itself. The first process would result in a residual of porous, iron stained galena, instead of the well-crystallized lead sulphide so characteristic of these openings. Moreover, the occurrences of large amounts of this so-called "cog mineraP in the Dubuque and Elizabeth districts at practically the top of the Galena dolomite seems to preclude the second process ; furthermore, such lead ore found lower in the forma- tion, and known to be due to secondary concentration, always occurs in small crystals.
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To quickly assess the difficulty of the text, read a short excerpt:
Buckley and Buehler,^^ however, have shown that lead, zinc, and iron sulphides precipitated from neutral'^ solutions are thrown down in an intimate mixture. Further, lead and zinc sulphides are thrown down from alkaline solutions when precipitated by the neutralization or dilu- tion of their solutions, or by the action of hydrogen sulphide upon them.
Hence the formation of pure crystals of galena by this theory would in- volve a primary concentration of mixed sulphides and a later segrega- tion..., either by the leaching out of the more soluble zinc and iron sulphides or by the solution of the whole and the reprecipitation of the galena by itself. The first process would result in a residual of porous, iron stained galena, instead of the well-crystallized lead sulphide so characteristic of these openings. Moreover, the occurrences of large amounts of this so-called "cog mineraP in the Dubuque and Elizabeth districts at practically the top of the Galena dolomite seems to preclude the second process ; furthermore, such lead ore found lower in the forma- tion, and known to be due to secondary concentration, always occurs in small crystals.
What to read after Bulletin - Illinois State Geological Survey?
You can find similar books in the "Read Also" column, or choose other free books by Illinois State Geological Survey to read onlineMoreLess
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