Formula: Ca2(Mn,Fe)(PO4)2 . 2H2O
Origin of name: Locality; Fairfield Co., Connecticut
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell: a = 5.78 Ǻ, b = 6.57 Ǻ, c = 5.48 Ǻ, α = 102.1°, β = 108.7°, γ = 90.1°
Colour: White, yellowish, greenish, white
Diaphaneity:
Luster: Vitreous to pearly
Habit: Crystals prismatic to equant; lamellar, foliated, fibrous, in radiating masses
Hardness: 3.5
Specific gravity: 3.08
Cleavage: 3; {001} perfect, {010} good, {1-10} distinct
Tenacity: Uneven; brittle
Streak: White
Synonyms/varieties:
Comments:
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