Erythrite
Chemical Formula	Co3(AsO4)2·8H2O
Species	Phosphates
Crystal System	Monoclinic
Mohs Scale	1-2
Specific Gravity	3.06
Color	Crimson to peach-red, pale rose, or pink, may be zoned
Streak	Pale red to pink
Luster	Sub-Vitreous, Waxy, Pearly, Dull, Earthy
Refractive Index	n = 1.626 - 1.629 n = 1.662 - 1.663 n = 1.699 - 1.701
Diaphaneity	Transparent, Translucent
Cleavage	PerfectPerfect on , poor on
Crystal Habit：Radial or stellate aggregates, fibrous, drusy; usually powdery and massive - rarely as striated prismatic crystals
Geological Setting：A secondary mineral in the oxidation zone of some Ni-Co-As mineral deposits.