DIABASE

Diabase

Diabase or dolerite or microgabbro is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled margins which may contain tachylite .

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diabase

Noun

  1. A fine-grained igneous rock composed mostly of pyroxene and feldspar


The above text is a snippet from Wiktionary: diabase
and as such is available under the Creative Commons Attribution/Share-Alike License.

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