Koragoite

General Information: Chemical Formula:(Mn++,Fe+++)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20 Environment:In granitic pegmatites. IMA Status:Approved IMA 1995 Locality:Vez-Dara River valley, Shakhdara Range, in the southwestern Pamir Mountains, Tajikistan. Name Origin:Named after Aleksei Aleksandrovich Korago (1942-1993), geologist who investigated the formation of river pearls in the Arkhangel'sk district of Russia, and the origin of amber.Physical Properties: Cleavage:None Color:red or brownish red. Density:4.7 - 6.22, Average = 5.46 Diaphaniety:Opaque Habits:Platy - Sheet forms (e.g. micas)., , Hardness:4-5 - Fluorite-Apatite Luster:Metallic Streak:grayish brownMore details...