Formula: Al2(PO4)(SO4)(OH).9H2O
Origin of name: after locality San Juan Province, Argentina
Crystal system: triclinic
Crystal class: unknown
Twinning:
Unit cell:
Colour: white
Diaphaneity:
Luster: dull to silky
Habit: microscopic fibers in parallel or divergent bundles in aggregates, chalk-like masses
Hardness: 3
Specific gravity: 1.94
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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