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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.[1][2]


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]


1. ^ http://webmineral.com/data/Warwickite.shtml Webmineral
2. ^ http://www.mindat.org/min-4245.html Mindat
3. ^ http://rruff.geo.arizona.edu/doclib/hom/warwickite.pdf Handbook of Mineralogy

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