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What does biotite mean?

Looking for the meaning or definition of the word biotite? Here's what it means.

Noun
  1. (mineralogy) A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.
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All four samples are medium-grained, and comprise variable proportions of hornblende, feldspar and quartz with accessory biotite and titanite.
These microfaults are commonly pulled apart with growth of new quartz and biotite between pulled apart feldspar and hornblende.
In most of the intrusion, hornblende and biotite are both present, but occasionally either may constitute the sole mafic phase.
The pegmatites are composed of K-feldspar, quartz, plagioclase and biotite, with titanite, opaque minerals and apatite as accessory minerals.
Secondary titanite, chlorite, white mica and pyrrhotite are abundant, and some samples contain metamorphic biotite.
The spotted textures are marked by the growth of biotite, cordierite and andalusite on the metamorphic foliation.

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