Warwickite

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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.

It was first described in 1838 near Warwick, Orange County, New York.

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