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76 SILVER. Constituent Parts. According to Klaproth, the brittle silver-glance from the mine Hoffiiung Gottes in Gross-Voightsberg near Prey berg, affords Silver, - . . 66.50 Sulphur, . . . 120 0 Antimony, . . . 10 00 Iron > - - - - 5.00 Copper and Arsenic, - 0.50 Earthy substances, . 1.00 t 05.00 Klaproth, Beit. b. i. s. 166. Geognostic Situation. It occurs in veins that traverse gneiss, clay-slate, and porphyry, and in these it is accompanied with other ores of silver; also ores of lead, zinc, copper, cobalt, iron, and more rarely gold, and also with quartz, calc&reonq- spar, and brown-spar. Geographic Situation. Europe.—This ore occurs in the district of Freyber" in Saxony, in veins, along with native silver, silver-glance or sulphureted silver, dark red silver-ore, white silver-ore, galena or lead-glance, black blende, &c. with brown-spar’ calcareous-spar, and quartz, seldomer with heavy-spar and fluor-spar: in the Upper Erzgebirge, both on the Saxon and Bohemian sides, it is associated with light red silver-ore, white cobalt-ore, native arsenic, silver-glance; also native silver, iron-pyrites, eopper-pyrites, brown- spar, and calcareous-spar, and these veins occur in gneiss and