The deposits of the useful minerals & rocks; their origin, form, and content . d more particularly at Call in the Caller Stollen, in the Meinertz-hagen Bleiberg property, the Virginia mine, and in the Gottessegen mine onthe Griesberg. The relation between the lead and copper is very the ore, dolomite, calcite, pyrite, and barite, occur in druses. Alter-nating ^vith these conglomerates are coarse-grained sandstones, the grainsof which are often transparent, sometimes crystal-shaped, but generallyrounded. The matrix is frequently sihceous-argillaceous, often ferruginous,and occasio
The deposits of the useful minerals & rocks; their origin, form, and content . d more particularly at Call in the Caller Stollen, in the Meinertz-hagen Bleiberg property, the Virginia mine, and in the Gottessegen mine onthe Griesberg. The relation between the lead and copper is very the ore, dolomite, calcite, pyrite, and barite, occur in druses. Alter-nating ^vith these conglomerates are coarse-grained sandstones, the grainsof which are often transparent, sometimes crystal-shaped, but generallyrounded. The matrix is frequently sihceous-argillaceous, often ferruginous,and occasionally somewhat calcareous. These sandstones are characterized by the occurrence of ore these are understood roundish concretions of 1-5 mm. diameter, con-sisting of quartz grains, mth galena, more rarely cerussite, azurite, andmalachite, as cement. The barren or worthless beds, in the place of leadore, carry iron- or manganese hydrate. It is an interesting fact that the 1174 OEE-DEPOSITS galena nodules frequently present the angularity characteristic of crystals,. ^ ^^ V^ Low Devon. Mid. Devon. LowiMid. Upper Keuper. Bunter ^ Diluvium. Alluvium FaultsFig. 453.—Geological map of the district around Mecheruich. Geol. Map of Prussia. while occasionally even cube-shaped outlines may be recognized. Cerussiteoccurs as a secondary alteration product at the outcrop. The copper ores THE LEAD ORE-BEDS 1175 may also sometimes occur in pea-sized concretions of irregular shape, thoughgenerally they form a more regular impregnation. The relation of thenodules to the sandstone mass is very variable ; while in some places thesenodules occur close together, in others there are wide intervals where noneare found. Blanckenhorn mentions, in addition, both smaller and larger globularconcretions, which differ from the enclosing sandstones in their greatercompactness, and have a cement of crystalline dolomite, and exceptionallycalcite. More rarely larger nodules are me
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
