1) An altered dolerite 2) Aphanitic rock
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https://www.crosswordclues.com/clue/diabase
Diabase 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). ==Petrography== Diabase normally has a fine, ...
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http://en.wikipedia.org/wiki/Diabase
• (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.
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http://thinkexist.com/dictionary/meaning/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 ... [1 related articles]
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http://www.britannica.com/eb/a-z/d/41
<chemical> A basic, dark-coloured, 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. ... Origin: F. Diabase, fr. Gr. A crossing or passing over, fr.; + to go; so called by Brongniart, be...
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http://www.encyclo.co.uk/local/20973
Di'a·base noun [ French
diabase , from Greek ... a crossing or passing over, from ...; ... + ... to go; -- so called by Brongniart, because it passes over to diorite.]
(Min.) A basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene wi...
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http://www.encyclo.co.uk/webster/D/56
Diabase is a dark, intrusive, basic igneous rock made up of plagioclase feldspar crystals, surrounded by smaller grains of pyroxenes, such as augite and up to ten percent quartz. Diabase is formed from magna that has cooled just below the Earth's surface, and is sometimes found as intrusions in older rock. A common place to find diabase is in the n...
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http://www.probertencyclopaedia.com/browse/HD.HTM
A granular igneous rock, dark gray to black, sometimes called dolerite.
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http://www.selectstone.com/architectural-resources/stone-glossary/
rock that is, in essence, a fine-grained gabbro.
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https://www.encyclo.co.uk/local/20132
Alternative name for dolerite (a form of basalt that contains very little silica), especially dolerite that has metamorphosed
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https://www.encyclo.co.uk/local/21221
a crystalline igneous rock rich in magnesium & iron content; equivalent to volcanic basalt
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https://www.encyclo.co.uk/local/21787
A common basic igneous rock usually occurring in dykes or sills.
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https://www.encyclo.co.uk/local/22734
a fine-grained gabbro occurring as minor intrusions. · a dark igneous rock consisting essentially of augite and feldspar; an altered dolerite.
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https://www.infoplease.com/dictionary/diabase
No exact match found.
