Formula: (K,Na)5Al2(Ta,Nb)22O60
Origin of name: for A.F. Sosedko, Russian mineralogist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: colourless
Diaphaneity:
Luster: adamantine
Habit: crystals acicular, to 0.1 mm
Hardness: 6
Specific gravity: 6.90
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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