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warwickite
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.〔http://webmineral.com/data/Warwickite.shtml Webmineral〕〔http://www.mindat.org/min-4245.html Mindat〕 ==Occurrence== 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.〔http://rruff.geo.arizona.edu/doclib/hom/warwickite.pdf Handbook of Mineralogy〕
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「warwickite」の詳細全文を読む
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