Diabase (/ ˈ d aɪ. ə b eɪ s /) 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 (dark mafic glass). Diabase is the preferred name in North America, yet dolerite is the ...
Diabase: Diabase, fine- to medium-grained, dark gray to black intrusive igneous rock. It is extremely hard and tough and is commonly quarried for crushed stone, under the name of trap. Although not popular, it makes an excellent monumental stone and is one of the dark-coloured rocks commercially known as
Diabase (dolerite) is a dark-colored igneous rock.It is compositionally equivalent to gabbro and basalt but texturally between them. Diabase is a common rock type.It occurs mostly in shallow intrusions (dikes and sills) of basaltic composition.
di·a·base (dī′ə-bās′) n. A dark-gray to black, fine-textured igneous rock composed mainly of feldspar and pyroxene and used for monuments and as crushed stone. [From French diabase, originally meaning "diorite," (now "basalt or gabbro lightly modified by metamorphism"), coined by French mineralogist Alexandre Brongniart (1770-1847), probably ...
A dark-gray to black, medium-grained igneous rock consisting mainly of labradorite and pyroxene. Diabase is compositionally similar to andesite, but has coarser grains.
Diabase is an intrusive igneous rock with the same mineral composition as basalt. It cools under basaltic volcanoes, like those at mid-ocean ridges. Diabase cools moderately quickly when magma moves up into fractures and weak zones below a volcano. There, it forms dikes (tabular igneous rock bodies ...
‘Intrusion of diabase at Mt. Butters has resulted in low-grade contact metamorphism of the pre-existing sedimentary strata.’ ‘If natural stone, such as basalt or diabase, is used, the product is called rock wool.’ ‘It is also a widespread constituent of a variety of igneous and metamorphic ...
*dolerite (*diabase*, *microgabbro*)* A dark-coloured, medium-grained igneous  rock which contains plagioclase feldspar  of labradorite composition and pyroxene  of augite  or titanaugite composition as essential minerals , and magnetite , titano-magnetite, or ilmenite  as a
Diabase definition is - diorite. History and Etymology for diabase. French, probably from Greek diabasis act of crossing over, from diabainein to cross over, from dia-+ bainein to go — more at come
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