Formula: (Fe,Y,Ca,U,Ce)(Nb,Ta,Ti)O4
Origin of name: for V. Samarski-Byhovets, Russian engineer
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: velvety black, exterior brownish or yellowish
Diaphaneity: opaque to translucent in thin fragments
Luster: vitreous, resinous, submetallic on fresh fracture
Habit: crystals prismatic, rectangular cross section, may be elongated, tabular or flattened, massive, compact
Hardness: 5 to 6
Specific gravity: 5.15 to 5.69
Cleavage: 1; {010} distinct
Tenacity:
Streak: black to reddish brown
Synonyms/varieties:
Comments:
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