Formula: CaCuAlSi2O6(OH)3
Origin of name: for Papago indians, early inhabitants near Ajo, Arizona, USA
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 12.91 Å, b = 11.48 Å, c = 4.69 Å, b = 100.6°
Colour: blue
Diaphaneity:
Luster: vitreous
Habit: crystals nearly equidimensional, smaller than 1 mm, slightly flattened, coatings, microcrystalline aggregates
Hardness: 5 to 5.5
Specific gravity: 3.25
Cleavage: 1; {100} distinct
Tenacity: brittle
Streak:
Synonyms/varieties:
Comments:
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