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santorinite |
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santorinite [san′tȯr·ə‚nīt]
(petrology) A light-colored extrusive rock containing approximately 60-65% silica and calcic plagioclase (labradorite to anorthite) as the only feldspar. A hypersthene andesite containing plagioclase crystals that have labradorite cores and sodic rims and a groundmass with microlites of sodic oligoclase. 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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