Warwickite | |
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![]() Warwickite sample | |
General | |
Category | Borate mineral |
Formula (repeating unit) | (Mg,Fe2+)3Ti[O,BO32 |
IMA symbol | Wwk [1] |
Strunz classification | 6.AB.20 |
Crystal system | Orthorhombic |
Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
Space group | Pnam |
Identification | |
Color | dark brown, grey to black¨ |
Cleavage | perfect on {100} |
Fracture | irregular/uneven |
Mohs scale hardness | 3-4 |
Luster | sub-Vitreous, pearly, sub-metallic, dull |
Streak | bluish black |
Specific gravity | 3.34 - 3.36 |
References | [2] |
Warwickite is an iron magnesium titanium borate mineral with the chemical formula ( Mg Fe)3 Ti( O, BO3)2 or Mg(Ti,Fe3+, Al)(BO3)O. It occurs as brown to black prismatic orthorhombic crystals which are vitreous and transparent. It has a Mohs hardness of 3 to 4 and a specific gravity of 3.36. [3] [4]
It occurs metasomatized limestone skarns and in lamproite and carbonatite veinlets. It was first described in 1838 near Warwick, Orange County, New York. It has also been reported from Bancroft, Ontario; in Murcia Province, Spain; in Siberia and near Pyongyang, North Korea. [5]