noun \ˈdī-ə-ˌbās\

Definition of DIABASE

archaic :  diorite
chiefly British :  an altered basalt
:  a fine-grained rock of the composition of gabbro but with an ophitic texture
di·a·ba·sic \ˌdī-ə-ˈbā-sik\ adjective

Origin of DIABASE

French, probably from Greek diabasis act of crossing over, from diabainein to cross over, from dia- + bainein to go — more at come
First Known Use: circa 1816


noun    (Concise Encyclopedia)

Fine- to medium-grained, dark gray to black intrusive igneous rock. Diabase is one of the dark rocks known commercially as “black granite.” It is extremely hard and tough and is commonly quarried for crushed stone, under the name “trap.” Chemically and mineralogically, diabase closely resembles the volcanic rock basalt, but it is generally somewhat coarser grained.

Variants of DIABASE

diabase or dolerite


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