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Mineral mining
The extraction of valuable minerals or other geological materials from the earth for economic interests.
Industry: Mining
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Mineral mining
argyrite
Mining; General mining
正交礦物、 Ag 2 S;等軸測圖高於 180 度 C ；dimorphous 與 acanthite ；大規模或作為塗層 ；金屬鉛灰色 ；軟、 開槽 ；sp gr，7.3 ；在靜脈與 162 其他銀和硫化礦物 ；通常 pseudomorphous 後 acanthite ；銀重要礦石。 ...
naumannite
Mining; General mining
正交礦物、 Ag 2 Se ；pseudocubic ；黑 ；光澤 ；形式重、 開槽顆粒群眾 ；此外在薄板 ；淺成熱液 ；一些存款中的銀的主要來源。
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