augite

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Related to augitic: augite, biotite
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dark-green to black glassy mineral of the pyroxene group containing large amounts of aluminum and iron and magnesium

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Some orthopyroxene crystals may also support narrow augitic rims ([En.
These lines of evidence include: (a) chilled magmatic enclaves which probably represent the material that mingled with felsic magma, causing thermal and compositional disequilibrium; (b) presence of more and less silicic amphiboles in the same sample, some of them showing reaction textures and inverse zoning; (c) bronzite and hypersthene orthopyroxenes displaying augitic reaction rims, and (d) sieved plagioclase crystals and their occurrence together with clear normal plagioclase, as well as oscillatory zoning of sieved plagioclase.