Formula: FeAl2(PO4)2(OH)3.7H2O
Origin of name: after locality Siglo XX mine, Llallagua, Bolivia
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell: a = 5.26 Å, b = 10.52 Å, c = 7.06 Å, a = 107.0°, b = 111.5°, g = 69.5°
Colour: pale straw-yellow to light brown
Diaphaneity:
Luster:
Habit: crystals short prismatic to thick tabular
Hardness: 3
Specific gravity: 2.35
Cleavage: 2; {010} perfect, {001} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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