- (of igneous rocks) having only crystalline components and no glassCompare hemicrystalline
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Examples from the Web for holocrystalline
They are holocrystalline in form and true glassy bases are rare, rendering the term diabase more appropriate than basalt.
Some hollow trees show interiors beautifully lined with holocrystalline quartz.The Yellowstone National Park
Hiram Martin Chittenden
It seems therefore that a holocrystalline pyroxene-garnet rock may be one source of the diamond found in blue ground.