Warwickite

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Warwickite
Warwickite.jpg
Warwickite sample
General
Category Mineral
Formula
(repeating unit)
(Mg,Fe2+)3Ti[O|BO3]2
Strunz classification 06.AB.20
Identification
Color dark brown, grey to black¨
Crystal system orthorhombic
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

Warwickite is an iron magnesium titanium borate mineral with formula: (MgFe)3Ti(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.[1][2]

Occurrence[edit]

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.[3]

References[edit]