Formula: (Ca,Ce)(Nb,Ta,Ti)2O6
Origin of name: from locality, Orcesco, on Alpe Rosso, Val Vigezzo Novara, Piemonte, Italy
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 7.559, b = 11.028, c = 5.36
Colour: Bright yellow orange, orange-yellow, orange
Diaphaneity: Subtranslucent to opaque
Luster: Submetallic
Habit: Crystals flat prismatic, to 2-3 mm, striated || [001] on {100}
Hardness: 4.5 to 5
Specific gravity: 5.54
Cleavage: 1; {010} distinct
Tenacity: Brittle, conchoidal fracture
Streak: White
Synonyms/varieties:
Comments:
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