Bulletin . of the schists nearthe native copper in epidote. In some instances small areas were noted inthe quartz and epidote, filling spaces that had once been filled with nativecopper. Other areas were seen in which a core of copper still cuprite is believed to be of supergene or secondary origin and to havebeen derived from the native copper. MINERALOGY OF THE VEINS. General statement.—The gangue minerals of the veins, exclusive of in-cluded fragments of schist, named in the approximate order of theirabundance are: Quartz, calcite, epidote, chlorite, hematite, sericite, albite,
Bulletin . of the schists nearthe native copper in epidote. In some instances small areas were noted inthe quartz and epidote, filling spaces that had once been filled with nativecopper. Other areas were seen in which a core of copper still cuprite is believed to be of supergene or secondary origin and to havebeen derived from the native copper. MINERALOGY OF THE VEINS. General statement.—The gangue minerals of the veins, exclusive of in-cluded fragments of schist, named in the approximate order of theirabundance are: Quartz, calcite, epidote, chlorite, hematite, sericite, albite,and possibly other plagioclase feldspars in small amount, and pinkorthoclase. The ore minerals named in the approximate order of their abundanceare: Bornite, chalcocite, native copper, malachite, azurite, cuprite, chal-copyrite, chrysocolla, klaprothite ( ?), pyrite, argentite, silver, and gold. Ofthese minerals, bornite (in part), chalcocite (in part), chalcopyrite (in VIRGINIA GEOLOGICAL SUKVEY PLATE (A) di a ,,iv tmiii tlir Wall miiir ^liowiii- the relation ofore aud gaiigue. I lie vein was divided at the point from which this specimenwas taken, and the piece here figured represents the entire width of oneportion of the vein. Dark areas = ore, chalcoeite and bornite. Light areas = vein matter, largely quartz.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectgeology, booksubjectm
