Formula: (K,Na,Ba)3(Ti,Nb)2Si4O14
Origin of name: for D. Shcherbakov, Russian mineralogist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: dark brown
Diaphaneity: translucent on thin edges
Luster: vitreous, greasy on fracture
Habit: crystals prismatic, elongated, generally not terminated
Hardness: 6.5
Specific gravity: 2.968
Cleavage: 2
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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