Formula: Ca(Ta,Nb)2O6
Origin of name: from Rynerson family, American mine operators
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 7.505, b = 11.063, c = 5.37
Colour: pale creamy white to reddish pink
Diaphaneity: Opaque
Luster: Submetallic
Habit: crystals fibrous, in felted masses, to several cm
Hardness: about 4.5
Specific gravity: 6.40
Cleavage: None
Tenacity: Uneven
Streak: White
Synonyms/varieties:
Comments:
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