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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). Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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