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apophyllite |
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apophyllite [ə′päf·ə‚līt]
(mineralogy) A hydrous calcium potassium silicate containing fluorine and occurring as a secondary mineral with zeolites with geodes and other igneous rocks; the composition is variable but approximates KFCa4(Si2O5)4·8H2O. Also known as fish-eye stone. 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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