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  Home  >>  Mineral Encyclopedia  >>  Mineral Photos  >>  Samarskite-Samarskite
Samarskite
Chemical
Formula
 (YFe3+Fe2+U,Th,Ca)2(Nb,Ta)2O8
Species
 Oxides & Hydroxides
Crystal
System
 Orthorhombic
Mohs
Scale
 5-6
Color
 Black, may have a brownish tint, brown to yellowish brown due to alteration; light to dark brown in transmitted light
Streak
 Reddish brown
Luster
 Vitreous - resinous
Refractive
Index
 n = 2.1–2.2
Diaphaneity
 Opaque, transparent in thin fragments
Cleavage
 , indistinct
Fracture
 Conchoidal fragments
Crystal Habit：Crystals elongated with pyramidal terminations; commonly granular to massive
Samarskite9045
Samarskite9045
Samarskite9044
Samarskite9044
Samarskite9043
Samarskite9043
Samarskite9042
Samarskite9042
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