LithoCat

MineralChalcophyllite
FormulaCu18Al2(SO4)3(AsO4)3(OH)27 ยท 33H2O
Crystal FormTrigonal/Rhombohedral [3]
CleavagePerfect on {0001}, Slight on {10-11}
ColorEmerald green, Grass green, Bluish green, Blue; Green in transmitted light
Density2.7 – 2.7 g/cm3
DiaphaneityTransparent, Translucent
FractureIrregular, micaceous parting
Hardness2.0
LustreSub-Adamantine, Vitreous, Pearly
StreakPale green to Bluish green
Dana 8 Class43.5.14.1
Strunz Class7/D.20-50
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WebMineralWebMineral
ID357