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Acidic Rock

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acidic rock [ə′sid·ik ′räk]
(petrology)
Igneous rock containing more than 66% SiO2, making it silicic.

Acidic Rock 

magmatic rocks oversaturated in silica (65–70 percent)—that is, containing a surplus of silica which is precipitated in the form of quartz (granite, diorite) or remains dissolved in the amorphous ground mass, or volcanic glass (obsidian, pitchstone).



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