You can find it here http://en.wikipedia.org/wiki/Schist
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2007-02-09 14:59:41
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answer #1
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answered by Anonymous
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The schists form a group of medium-grade metamorphic rocks, chiefly notable for the preponderance of lamellar minerals such as micas, chlorite, talc, hornblende, graphite, and others. Quartz often occurs in drawn-out grains to such an extent that a particular form called quartz schist is produced. By definition, schist contains more than 50% platy and elongated minerals, often finely interleaved with quartz and feldspar.
The individual mineral grains in schist, drawn out into flaky scales by heat and pressure, can be seen by the naked eye. Schist is characteristically foliated, meaning the individual mineral grains split off easily into flakes or slabs. The characteristic flaky texture of schist gives rise to the adjective "schistose".
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Schists have intermixed quartz, feldspar, and mica (biotite and/or muscovite), and often amphibole. This specimen is dominated by biotite, quartz, and feldspar. Often other minerals are present too, such as garnet and staurolite, but none are present in this particular specimen.
2007-02-09 15:00:00
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answer #3
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answered by landhermit 4
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