Formula: MnAl(PO4)(OH)2 . H2O
Origin of name: Form Greek for dawn-bearing
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning: On {100}
Unit cell: a = 10.45 Ǻ, b = 13.49 Ǻ, c = 6.93 Ǻ
Colour: Colourless, pale pink, pale yellow, light brown, reddish brown,
Diaphaneity:
Luster: Vitreous to resinous
Habit: Crystals short to long prismatic, flattened; coarse radial aggregates
Hardness: 5
Specific gravity: 3.05
Cleavage: 1; {100} poor
Tenacity: Subconchoidal to uneven
Streak:
Synonyms/varieties:
Comments: Series with childrenite
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