Formula: NaFe9(PO4)6(OH)10 . 5H2O
Origin of name: For A. Kidwell, American geologist
Crystal system: Monoclinic
Crystal class: 2 or m or 2/m
Twinning:
Unit cell: a = 20.61 Ǻ, b = 5.15 Ǻ, c = 13.75 Ǻ, β = 112.6°
Colour: Pale green to greenish-yellow, greenish white, bright
Diaphaneity:
Luster: Silky
Habit: Crystals acicular, elongated parallel to {010}; in spheres and rosettes
Hardness: 3
Specific gravity: 3.04
Cleavage: 1; {100} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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