. Transactions. n limestone fragments in the form of crystalline masses,forming a limestone breccia. The relative proportions of ce-ment (recrystallized calcite and dolomite) to rock fragmentsvary widely. (a) Dolomite and Calcite.—These minerals occur intimatelyadmixed in massive crystalline form, filling the fractures be-tween the broken limestone fragments, which cement them to-gether as breccia. They are prevailingly white in color, and 692 LEAD- AND ZINC-DEPOSITS VIRGINIA-TENNESSEE REGION. frequently occur in perfect cleavable masses of the rhombo-hedral type. Numerous analyses of specimen
. Transactions. n limestone fragments in the form of crystalline masses,forming a limestone breccia. The relative proportions of ce-ment (recrystallized calcite and dolomite) to rock fragmentsvary widely. (a) Dolomite and Calcite.—These minerals occur intimatelyadmixed in massive crystalline form, filling the fractures be-tween the broken limestone fragments, which cement them to-gether as breccia. They are prevailingly white in color, and 692 LEAD- AND ZINC-DEPOSITS VIRGINIA-TENNESSEE REGION. frequently occur in perfect cleavable masses of the rhombo-hedral type. Numerous analyses of specimens of the calciteand dolomite collected over the Virginia-Tennessee districtgave nearly pure calcium carbonate for the former, and a ratioof calcium to magnesium of 1: 1 for the latter, which is theratio of normal dolomite. (b) Fluorite.—At the mines in Albemarle county, Va., fluorite,the predominant mineral, occurs in both large and small lensesin the crinkled schist, and it is usually of white color, though. WLIME5T0NE \>> CALCITE FLUORITE
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
