Biotite:S1440
Item
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Title
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Biotite:S1440
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Description
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Chemical Formula: K(Mg,Fe2+)(Al,Fe3+)[(Al,Si)3O10](OH,F)2 Compositional Family: iron aluminum silicate
Structural Family: sheet silicate/phyllosilicate
Crystal System: monoclinic
Location: Franklin, NJ
Texture: in mass
Crystal Form: micaceous mass
Crystal Habit: elastic mica flakes/sheets
Color: brown, black, brownish black
Luster: vitreous/pearly
Hardness: 2.5-3
Streak Color: white
Relative Density: medium (2.8-3.4)
Transparency: opaque
Cleavage/Fracture: 1 perfect direction
Common Associations: metamorphic rocks (schist, gneiss); igneous rocks (granite, rhyolite)
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Creator
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6037
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Type
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Mineral
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Mediator
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Tamara Carley
https://exhibits.lafayette.edu/geology/files/original/f952cbf0d5f8cde4307a0b663e51db9a.JPG
https://exhibits.lafayette.edu/geology/files/original/c3f4456675d3685ec78536af4c99805b.JPG
https://exhibits.lafayette.edu/geology/files/original/8d64136018cac2e0ab09d2fde125f9f5.JPG
https://exhibits.lafayette.edu/geology/files/original/7bb424a9e909c5ac2e5d96576410b921.JPG
https://exhibits.lafayette.edu/geology/files/original/6be56edf6a76a22789c92e50db03b4ea.JPG