Details of vug lining, North Star mine. Nevada County, California. 1931.
Dates
Date Taken
1931
Summary
Details of vug lining: thin section of vug filling; euhedral quartz is surrounded by a vein of ankerite (dark) and a vein of smaller quartz combs (light). At that stage the vug lining was disturbed, and some of the euhedral quartz crystals were broken. Finally a mixture of chlorite and mechanically ground quartz cemented by ankerite filled the entire vug and formed a matrix around the earlier combs, North Star mine, No. 2 vein, 6,300-foot level. Crossed nicols. Nevada County, California. 1931. Plate 16-B, U.S.Geological Survey Professional paper 194. 1940.
Summary
Details of vug lining: thin section of vug filling; euhedral quartz is surrounded by a vein of ankerite (dark) and a vein of smaller quartz combs (light). At that stage the vug lining was disturbed, and some of the euhedral quartz crystals were broken. Finally a mixture of chlorite and mechanically ground quartz cemented by ankerite filled the entire vug and formed a matrix around the earlier combs, North Star mine, No. 2 vein, 6,300-foot level. Crossed nicols. Nevada County, California. 1931. Plate 16-B, U.S.Geological Survey Professional paper 194. 1940.
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