Kampfite
Phyllosilicate mineral / From Wikipedia, the free encyclopedia
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Kampfite is a rare barium silicate–carbonate–halide mineral with the chemical formula Ba12(Si11Al5)O31(CO3)8Cl5. Discovered in 1964 and described in 2001, it is named after Anthony R. Kampf. The mineral is known only from Fresno County, California.
Quick Facts General, Category ...
Kampfite | |
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General | |
Category | Phyllosilicate |
Formula (repeating unit) | Ba12(Si11Al5)O31(CO3)8Cl5 |
IMA symbol | Kpfb[1] |
Strunz classification | 9.EG.20 |
Crystal system | Monoclinic |
Crystal class | Domatic (m) (same H-M symbol) |
Space group | Cc |
Unit cell | a = 31.2329, b = 5.2398 c = 9.0966 [Å]; β = 106.933°; Z = 1 |
Identification | |
Color | Light blue gray |
Crystal habit | Irregular grains or anhedral crystal inclusions |
Cleavage | Good on {001} |
Fracture | Uneven |
Tenacity | Brittle |
Mohs scale hardness | 3 |
Luster | Vitreous |
Streak | White |
Diaphaneity | Translucent |
Specific gravity | 3.45 |
Optical properties | Uniaxial – (strongly pseudohexagonal) |
Refractive index | nω = 1.642 nε = 1.594 |
Birefringence | δ = 0.048 |
References | [2][3] |
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