LithoCat

MineralAlunogen
FormulaAl2(SO4)3 • 17H2O  
Crystal FormTriclinic/Pinacoidal [1]
CleavagePerfect on {010}, Probable on {100} and {-3-13}.
ColorCrystals colorless, aggregates white, pale yellow or red from impurities
Density1.7 – 1.8 g/cm3
DiaphaneityTransparent
Hardness1.5 - 2.0
LustreVitreous, Silky
StreakWhite
Dana 8 Class29.8.6.1
Strunz Class6/C.08-70
Mindatmindat.org
WebMineralWebMineral
ID309