Igneous rock formed below the Earth's surface, a form of basalt, containing relatively little silica (basic in composition).
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Diabase is a medium-grained (hypabyssal) basalt and forms in minor intrusions, such as dykes which cut across the rock strata, and sills, which push between beds of sedimentary rock. When exposed at the surface, diabase weathers into spherical lumps.
Mineral iz starijeg paleozojskog doba, obično gust i tamnozelen, tj. eruptivan kamen, pogodan za gradnju puteva. (grč.)