Formula: CaMn(AsO3OH)2 . 2H2O
Origin of name: For Pierre Fluck, mineralogist Louis Pasteur University, Strasbourg, France.
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 8.459, b = 7.613, c = 6.968, α = 82.21°, β = 98.25°, γ = 95.86°
Colour: Pink, pale rose to deep rose, colourless, colour increases with increasing cobalt content
Diaphaneity: Transparent to translucent
Luster:
Habit: Crystals prismatic, in radiating groups to spherulitic groups
Hardness: 3.5 to 4
Specific gravity: 3.05
Cleavage: 3; {010} perfect, {100} easy, {-101} imperfect and difficult
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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