Formula: Ca2(CO3)F2
Origin of name: From locality; Brenk, Eifel, Germany
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity:
Luster:
Habit: Crystals lath-like in radiating aggregates
Hardness:
Specific gravity: 3.10
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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