General Information:
Chemical Formula:
Na4Mg4Cl12·Mg5Al4(OH)22
Composition:
(Molecular Weight = 1,218.22 gm)
Sodium 7.55 % Na
Magnesium 17.96 % Mg
Aluminum 8.86 % Al
Hydrogen 1.82 % H
Chlorine 34.92 % Cl
Oxygen 28.89 % O
Empirical Formula:
Na4Mg9Cl12Al4(OH)22
Environment:
Potash mine.
Locality:
Justus I near Volpriehausen, and elsewhere in Hannover, Germany.
Name Origin:
Named for Adolf von Koenen (1837-1915), German geologist of Gottingen, who first found the mineral.
Physical Properties:
Cleavage:
[0001] Perfect
Color:
colorless, light yellow, or dark red.
Density:
1.98
Diaphaniety:
Transparent to Translucent
Habits:
Encrustations - Forms crust-like aggregates on matrix., ,
Hardness:
1.5 - Between Talc and Gypsum
Luster:
Pearly
Streak:
white
More details...