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augite

Line breaks: aug¦ite
Pronunciation: /ˈɔːdʒʌɪt
 
/

Definition of augite in English:

noun

[mass noun]
A dark green or black aluminosilicate mineral of the pyroxene group. It occurs in many igneous rocks, including basalt, gabbro, and dolerite.
Example sentences
  • As cooling continues, plagioclase (a mixture of two kinds of aluminum silicates) and the pyroxene mineral augite (a magnesium silicate mixed with some iron) form.
  • The plagioclase feldspar weathers to produce a whitish gray rock, while the mafic minerals (olivine, augite and hypersthene) produce contrasting darker grains.
  • The most common phenocryst silicate phases are olivine, plagioclase and augite, typically, although not always, appearing in that order.

Origin

early 19th century: from Latin augites, denoting a precious stone (probably turquoise), from Greek augitēs, from augē 'lustre'.

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