Biotite
a very common mineral of the mica group, occurring in black, dark-brown, or dark-green sheets and flakes: an important constituent of igneous and metamorphic rocks.
Historical Examples
South! Sir Ernest Shackleton
The Long Labrador Trail Dillon Wallace
Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 Various
The Long Labrador Trail Dillon Wallace
Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 Various
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 5 Various
Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 Various
The Birth-Time of the World and Other Scientific Essays J. (John) Joly
Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 Various
Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 Various
noun
a black or dark green mineral of the mica group, found in igneous and metamorphic rocks. Composition: hydrous magnesium iron potassium aluminium silicate. Formula: K(Mg,Fe)3(Al,Fe)Si3O10(OH)2. Crystal structure: monoclinic
biotite
(bī’ə-tīt’)
A dark-brown or dark-green to black mica. Biotite is monoclinic and is found in igneous, metamorphic, and sedimentary rocks. Chemical formula: K(Mg,Fe)3(Al,Fe)Si3O10(OH)2.
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