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Quartz Vein Forming In Black Slate

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Quartz vein forming in black slate sumdum mine wikipedia.Quartz and calcite are the gangue minerals, and films of graphite occur between the fillings and the blackslate country.Geography.A tunnel 3,500 feet 1,100 m in length undercuts the bald eagle vein 500 feet 150 m below the surface outcrop and encounters the sumdum chief at a.

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