Titanite from Capelinha, Minas Gerais, Brazil

The mineral titanite or sfeen is a fluorine-containing calcium-titanium-silicate having the chemical formula CaTiSiO5. Rare earth elements such as lanthanum, cerium, praseodymium, samarium and neodymium in small quantities in the mineral for. The mineral belongs to the nesosilicaten. Gray, green, yellow, red or reddish brown titanite has a diamond shine, a red and white stripe color and cleavage of the mineral is clearly in accordance with the crystal plane [110] and imperfect according to [100] and [112]. The crystal system is monoclinic. Humiet has an average density of 3.48, the hardness is from 5 to 5.5 and the mineral is, by the inclusions of the rare earth elements, mildly radioactive. The gamma ray value according to the American Petroleum Institute is 3805.77. The mineral titanite is a common mineral in depth felsic rocks, pegmatites, gneisses, schists and skarns. The type of location is Passau, Bavaria, Germany. Titanite occurs in the sand fraction of Dutch Quaternary river sediments. The heavy mineral analysis as it took place in the Netherlands at the Geological Survey during the second half of the twentieth century, the mineral is classified among the so-called unstable group. It is there among the volcanic minerals. Different varieties can be distinguished of which there is a characteristic for Maas sands.