anorthose

anorthose

[ə′nȯr‚thōs]
(mineralogy)
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It mainly consists of anorthose, hornblende, potassium feldspar, biotite, quartz and a few monoclinic pyroxenes and metallic minerals.
Its primary minerals are anorthose, quartz, potassium feldspar, hornblende and a few iron pyrite and biotite, which are mostly subhedralanhedral crystals with a grain size of 0.