Euxenite
Chemical Formula	(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
Species	Oxides & Hydroxides
Crystal System	Orthorhombic
Mohs Scale	5.5-6.5
Specific Gravity	4.7-5
Color	Black, brownish black,greenish black
Streak	Yellowish, grayish, or reddish brown
Luster	Brilliant submetallic, waxy to resinous on fractures
Refractive Index	n = 2.06 - 2.24
Diaphaneity	Opaque, translucent on thin edges
Cleavage	None
Fracture	Conchoidal to subconchoidal
Crystal Habit：Massive, anhedral crystals in matrix