General Information:
Chemical Formula:(Fe++,Mg)9Al4Cl18(OH)12·14(H2O) (?)
Composition:(Molecular Weight = 1,634.03 gm)Magnesium 3.35 %
MgAluminum 6.60 %
AlIron 23.07 %
FeHydrogen 2.47 %
H Chlorine 39.05 %
ClOxygen 25.46 %
O Empirical Formula: 9(Fe2+0.75)9(Mg0.25)Al4Cl18(OH)12·14(H2O)
Environment:Marine evaporite deposits.
Locality:Hope, Hanover, Germany.
Name Origin:Named after Zirkler, director of the Aschersleben potash works, Germany.
Physical Properties: Cleavage:[1011] Perfect, [1011] Perfect, [1011] Perfect
Color:white or light gray.
Density:2.6
Diaphaniety:Transparent to translucent
Habits:Massive - Uniformly indistinguishable crystals forming large masses., ,
Hardness:3.5 - Copper Penny
Luster:Vitreous - Dull
Streak:white
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