Hypocrystalline | Article about hypocrystalline by The Free Dictionary
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Pertaining to the texture of igneous rock characterized by crystalline components in an amorphous groundmass. Also known as hemicrystalline; hypohyaline; merocrystalline; miocrystalline; semicrystalline.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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groundmass contains clinopyroxene (39-46 vol%, Mg# ~0.75), olivine (3-6vol%, [Fo.sub.74-76] mole%), titanomagnetite (4-7vol%, up to 43% ulv.
Those are hypocrystalline
alkaline trachytes and rhyolites (Pardo, 2004), that suggest that volatile release was continuous through the permeable conduit walls while magma rising occurred.
The basalts from Bbc are hypocrystalline
, subporphyritic and sub-intersertal in texture.
The main textures exhibited by the andesites are hypocrystalline