hypocrystalline


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hypocrystalline

(ˌhaɪpəʊˈkrɪstəˌlaɪn)
adj
(Geological Science) (of igneous rocks) having both glass and crystalline components. Former word: hemicrystalline See holocrystalline
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Calcite, hypocrystalline dolomite particles and tuffaceous materials were abundant in mudstone.
The phenocrysts are alkali feldspar (Or60-65) [+ or -] clinopyroxene (Wo46-49Fs14-20) [+ or -] plagioclase (An14-16), pseudomorphosed leucite, amphibole, and biotite in a hypocrystalline to glassy groundmass containing microlites of alkali feldspar, biotite, and clinopyroxene [+ or -] biotite [+ or -] amphibole [+ or -] magnetite [+ or -] Ti-andradite [+ or -] haematite.
They are fine- to medium-grained and holocrystalline to hypocrystalline; many are porphyritic and some display flow alignment in phenocrysts.