Warwickite
Warwickite is an iron magnesium titanium borate mineral with the chemical formula or. 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.
Occurrence
It occurs metasomatized limestone skarns and in lamproite and carbonatite veinlets. It was first described in 1838 near Warwick, [New York |Warwick], Orange [County, New York]. It has also been reported from Bancroft, Ontario; in Murcia Province, Spain; in Siberia and nearPyongyang, North Korea.