A fine-grained igneous rock composed mostly of pyroxene and feldspar
a basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene with magnetic iron; -- often limited to rocks pretertiary in age. It includes part of what was early called greenstone
Origin: [F. diabase, fr. Gr. a crossing or passing over, fr. ; + to go; -- so called by Brongniart, because it passes over to diorite.]
Diabase or dolerite is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. In North American usage, the term diabase refers to the fresh rock, whilst elsewhere the term dolerite is used for the fresh rock and diabase refers to altered material. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled margins which may contain tachylite.
Chambers 20th Century Dictionary
dī′a-bās, n. a compact igneous rock, an altered form of basalt—included under the popular names greenstone and trap.—adj. Diabā′sic.
The numerical value of diabase in Chaldean Numerology is: 8
The numerical value of diabase in Pythagorean Numerology is: 5
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