Formula: Ca2(Fe,Mn)(PO4)2 . 2H2O
Origin of name: Locality; Messel, Hesse, Germany
Crystal system: Triclinic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Colourless, white to pale greenish white, greenish gray
Diaphaneity:
Luster: Vitreous to pearly
Habit: Crystals prismatic to equant; masses, lamellar, foliated, fibrous; radiating aggregates
Hardness: 3.5
Specific gravity: 3.16
Cleavage: 3; {001} perfect, {010} good, {1-10} distinct
Tenacity: Uneven; brittle
Streak: White
Synonyms/varieties:
Comments:
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