Formula: CaV2(PO4)2(OH)4.3H2O
Origin of name: after locality Sincos, Dept of Junin, Peru
Crystal system: tetragonal
Crystal class: 4mm
Twinning: uncommon on {110}
Unit cell: a = 8.90 Å, c = 12.73 Å
Colour: grass-green, yellowish green to olive-green, brownish green
Diaphaneity:
Luster: vitreous, altered crystals submetallic
Habit: crystals thin to thick tabular, mostly square cross section, radial aggregates, massive, compact, scaly or irregular
Hardness: 1
Specific gravity: 2.98
Cleavage: 3; {001} perfect, {100} and {110} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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