phenocryst

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phenocryst

[′fēn·ə‚krist]
(petrology)
A large, conspicuous crystal in a porphyritic rock. Also known as phanerocryst.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Phenocrystic plagioclase cores range between [An.sub.43] and [An.sub.10], rarely [An.sub.50].
Groundmass plagioclases show generally higher proportion of Ab component than the phenocrystic ones, indicating a fractionation trend.
Zeolite-bearing trachyandesite from Dobranka, Ceske stredohori Mts.: petrography, geochemistry and amygdale mineralogy

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