Gatehouseite
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Gatehouseite is a manganese hydroxy phosphate mineral with formula Mn5(PO4)2(OH)4.[5] First discovered in 1987, it was identified as a new mineral species in 1992 and named for Bryan M. K. C. Gatehouse (born 1932). As of 2012[update], it is known from only one mine in South Australia.
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Gatehouseite | |
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General | |
Category | Phosphate mineral |
Formula (repeating unit) | Mn5(PO4)2(OH)4[1] |
IMA symbol | Ghs[2] |
Strunz classification | 8.BD.10[1] |
Dana classification | 41.4.1.2[1] |
Crystal system | Orthorhombic[3] |
Crystal class | Disphenoidal (222) (same H-M symbol) |
Space group | P212121[4] |
Unit cell | a = 17.9733(18) Å b = 5.6916(11) Å c = 9.130(4) Å V = 933.9(4) Å3 Z = 4[4] |
Identification | |
Color | Brownish orange to yellow[3] |
Twinning | On {001}, contact twins[3] |
Cleavage | Distinct on {010}[3] |
Fracture | Splintery[3] |
Mohs scale hardness | 4[1] |
Luster | Adamantine[1] |
Streak | Pale yellow[3] |
Diaphaneity | Transparent[3] |
Optical properties | Biaxial (+/−)[1] |
Refractive index | α = 1.74(1), β = n.d., γ = 1.76(1)[3] |
Birefringence | δ = 0.020[1] |
Pleochroism | Distinct; brown to nearly colorless[3] |
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