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phenocryst |
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phenocryst [′fēn·ə‚krist] (petrology) A large, conspicuous crystal in a porphyritic rock. Also known as phanerocryst. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| the presence of olvine and the lack of phenocrysts of sanidine rules out the Sabatini system' (a conclusion of the rubble study), the book aims to serve both a specialist and a general reader, and is generally successful in this. Phenocryst sequence = olivine, Phenocryst sequence = olivine, augite, plagioclase such that plagioclase, augite locally plagioclase phenocrysts are less yielding ophitic and subophitic common than in tholeiites. The most common phenocryst silicate phases are olivine, plagioclase and augite, typically, although not always, appearing in that order (Fig. |
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