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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. Olivine occurs in most samples, Olivine phenocrysts less common, phenocrysts zoned with Fe-rich generally unzoned, and may have a rims. hypersthene), most commonly in the matrix, locally as phenocrysts (Fig. |
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