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Intermediate Rock

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Intermediate Rock 

igneous rock containing 56–65 percent silica. This category includes primarily feldspathic rocks with small admixtures of such ferromagnesian minerals as pyroxene, hornblende, and, more rarely, biotite. Intermediate plagioclases (oligoclase, andesine) are typical of feldspars. According to the weight percentage of the constituents of intermediate rocks, a distinction is made between the sodium series (diorites, andésites, porphyrites) and the calcic series (syenites, trachytes).

Intermediate rocks are found mainly among extrusive rocks in which andésites and porphyrites predominate over trachytes and porphyries; the intrusive rocks (diorite, syenite) are much less widely distributed.



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The importance of amphibole as a phenocryst in intermediate rocks suggests it may play a role at this stage in the cooling of the magma.
The Silurian-Devonian Fogo Island Batholith, Newfoundland, is examined by Ken Currie, who shows that the sill-like bimodal body has a complex history including a late influx of mafic magma that resulted in hybrid intermediate rocks.
A four-hour techniques clinic for beginning and intermediate rock climbers will be held Saturday at 10 a.
 
 
 
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