Diabase

[daiәbeis]

Definition

(n.) 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.

Typist: Nathaniel

Definition

n. a compact igneous rock an altered form of basalt—included under the popular names greenstone and trap.—adj. Diabā′sic.

Inputed by Estella