Formula: Ca4Si2O6(CO3)(OH,F)2
Origin of name: Locality; Fuka, Japan
Crystal system: Orthorhombic
Crystal class: mm2 or 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: White to pale brown
Diaphaneity:
Luster:
Habit: Crystals flaky, microscopic
Hardness: 4
Specific gravity: 2.77
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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