Euxenite

Chemical compound

Euxenite, or euxenite-, is a brownish black mineral with a metallic luster. Wikipedia

IMA symbol: Eux

Color: Black, brownish black, greenish black

Crystal habit: Massive, anhedral crystals in matrix

Crystal system: Orthorhombic

Formula (repeating unit): (Y,Ca,Ce,U,Th)(Nb,Ta,Ti); ₂O; ₆

Optical properties: Isotropic

Specific gravity: 4.7 to 5