 ... They are strongly schistose and in many places they exhibit every evidence of having been crushed. The coarser varieties grade into garnetiferous pegmatites, though it is probable that some of them are crushed sedimentary rocks. The quartz-graphite...  Final Report - Seite 113von New Jersey Geological Survey, New Jersey. State Geologist - 1910Vollansicht - Über dieses Buch
 | University of Illinois (Urbana-Champaign campus) - 1908 - 658 Seiten
...crushed sedimentary rocks. The quartz-graphite schists are fine grained, very schistose, dark gray, friable rocks composed of quartz, biotite, muscovite,...most cases they occur in plates lying side by side. In thin section no traces of fragmental quartz grains can be detected. The rock is now completely crystallized.... | |
 | New Jersey Geological Survey, Geological Survey of New Jersey - 1910 - 568 Seiten
...long, thin layers of a garnetiferous graphitic gneiss, and of a graphite quartz schist. The former arc fine to coarse grained aggregates of quartz, feldspar,...the rock it is, nevertheless, thought that it was onginafly a sandstone, which has been recrystallized through the influence of igneous intrusions. PEGMATITE.... | |
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