Lectures On Geology Being Outlines of the Science Delivered in the New York At
Lectures On Geology Being Outlines of the Science Delivered in the New York At
Jeremiah Van Rensselaer
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Granular, rough : less translucent.
D. So hard as to strike fire easily ; but the par- ticles of quartz not visible.
283 ') This is the flinty slate or siliceous schist of some writers.
' : <&r' **v Second Division.
Compound : indurated schistose clay, with some other ingredient conspicuously mixed.
A. Simple argillite and mica.
a. The mica extremely thin and broad : passes into micaceous schist : the lustre silky or plumba- ginous.
b. The scales of mica minute, intermixed ir- regularly, or in laminae. The fine greywacke schist of some writers.
B. Simple argillite and talc; of a greasy feel, and silky lustre : passes into talcose schist.
C. Simple argillite intermixed with chlorite.
a. The chlorite invisibly minute, as if pow- dery, the fracture dull and earthy.
6, The chlorite foliated, or scaly, and the fracture glossy.
These varieties pass into chlorite schist.
D. Simple argillite with hornblende.
a. The hornblende in minute scaly crystals, or irregular grains, or flat plates.
b. The hornblende fibrous : fascicular : or else straight, or curved, and radiated.
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