A Microscopic Study of the Silver Ores And Their Associated Minerals
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, No. 42, p. 95, 1905.
41 Bastin, " Metasomatism in Downward Sulphide Enrichment, " EcoN. Geol. , Vol. 8, p. 51, 1913.
42 Whitehead, "Paragenesis of Certain Sulphide Intergrowth s, " EcoN. Geol. , Vol. II. P. I, 1916.
43 Weed and Pirsson, " Geology of the Little Belt Mountains, Mont. , " 20th Ann. Kept. U. S. Geol. Surv. , Pt. 3, p. 411, 1899.
320 F. N. GUILD.
In a specimen from the Seven Thirty mine near Georgetown, Colo. , tetrahedrite appeared as residual grains surrounded by polybasite in w...hich were found numerous wavy streaks of proust- ite. The two silver minerals were doubtless alteration products of arsenical tetrahedrite.
Polybasite as viewed on polished surfaces is considerably duller than galena and may easily be distinguished from tetrahedrite, which it closely resembles in color, by its inferior relief. It is distinguished from stephanite and pyrargyrite by the presence of copper, which is always in isomorphous mixture with the silver. It is sometimes cherry red on the thinnest edges like pyrargyTite.
What to read after A Microscopic Study of the Silver Ores And Their Associated Minerals?
You can find similar books in the "Read Also" column, or choose other free books by Frank Nelson Guild to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
, No. 42, p. 95, 1905.
41 Bastin, " Metasomatism in Downward Sulphide Enrichment, " EcoN. Geol. , Vol. 8, p. 51, 1913.
42 Whitehead, "Paragenesis of Certain Sulphide Intergrowth s, " EcoN. Geol. , Vol. II. P. I, 1916.
43 Weed and Pirsson, " Geology of the Little Belt Mountains, Mont. , " 20th Ann. Kept. U. S. Geol. Surv. , Pt. 3, p. 411, 1899.
320 F. N. GUILD.
In a specimen from the Seven Thirty mine near Georgetown, Colo. , tetrahedrite appeared as residual grains surrounded by polybasite in w...hich were found numerous wavy streaks of proust- ite. The two silver minerals were doubtless alteration products of arsenical tetrahedrite.
Polybasite as viewed on polished surfaces is considerably duller than galena and may easily be distinguished from tetrahedrite, which it closely resembles in color, by its inferior relief. It is distinguished from stephanite and pyrargyrite by the presence of copper, which is always in isomorphous mixture with the silver. It is sometimes cherry red on the thinnest edges like pyrargyTite.
What to read after A Microscopic Study of the Silver Ores And Their Associated Minerals?
You can find similar books in the "Read Also" column, or choose other free books by Frank Nelson Guild to read onlineMoreLess
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