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dolerite

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 accessory minerals. Where olivine also occurs as an additional mineral, the rock is termed an ‘olivine dolerite’. Where quartz occurs as an additional mineral in the groundmass, the rock is termed a ‘quartz dolerite’. Dolerites are the medium-grained equivalents of basalts and, like the basalts, can be divided into alkali and tholeiitic types (see also ALKALI BASALT; and THOLEIITE). Dolerites are commonly found in shallow level intrusions such as dykes, sills, or plugs.

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dolerite

dolerite mineral allied to basalt. XIX. — F. dolérite, f. Gr. dolerós deceptive; so named from the difficulty of discriminating its constituents; see -ITE.

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diabase

diabase: see basalt.

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diabase

diabase See DOLERITE.

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dolerite

doleriteHamite, samite •marmite • Semite • Vegemite •eremite • Hashemite • Fatimite •chromite • Edomite • sodomite •stalagmite • Elamite • dolomite •Adullamite • dynamite • catamite •Benthamite •termite, thermite •Samnite • sennight • midnight •lignite • selenite • gelignite •kaolinite • Leninite •finite, transfinite •watchnight • fortnight • Sunnite •exurbanite, suburbanite, urbanite •manganite • ammonite • Mennonite •Canaanite • Maronite • bentonite •Irvingite • respite • alexandrite •Arkwright • cartwright • nephrite •playwright • wainwright •wheelwright • millwright •shipwright • copyright • Nazirite •pyrite • eyebright • nitrite • contrite •chlorite • forthright • downright •Fulbright • upright • meteorite •diorite • fluorite •Labourite (US Laborite) • sybarite •Thatcherite • phosphorite • azurite •anchorite • Hitlerite • dolerite •Amorite • Minorite • laterite •Hutterite • birthright

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