Formula: (Fe,Mg,Mn)3(PO4)2 . 4H2O
Origin of name: For Henry Ludlam, British mineral collector
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 10.56 Å, b = 4.65 Å, c = 9.33 Å, β = 100.5°
Colour: Bright green, apple-green, pale green to greenish
Diaphaneity:
Luster: Vitreous
Habit: Crystals thin to thick tabular or wedge-shaped; massive granular
Hardness: 3.5
Specific gravity: 3.15
Cleavage: 2; {001} perfect, {100} indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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