Romeite

Roméite is a calcium antimonate mineral with the formula (Ca,Fe,Mn,Na)₂(Sb,Ti)₂O₆(O,OH,F). Roméite is a honey-yellow mineral crystallizing in the hexoctahedral crystal system. It has a Mohs hardness of 5.5-6.0. It occurs in Algeria, Australia, Brazil, China, Europe, Japan, New Zealand, and the United States in metamorphic iron-manganese deposits and in hydrothermal antimony-bearing veins.