General Information:
Chemical Formula:
Mg6Cr2(CO3)(OH)16·4(H2O)
Composition:
(Molecular Weight = 654.01 gm)
Magnesium 22.30 % Mg
Chromium 15.90 % Cr
Hydrogen 3.70 % H
Carbon 1.84 % C
Oxygen 56.27 % O
Empirical Formula:
Mg6Cr2(OH)16(CO3)·4(H2O)
Environment:
Alteration product of sepentine.
Locality:
Dundas, Tasmania.
Name Origin:
Named after Robert Sticht, director of a mining corporation.
Physical Properties:
Cleavage:
[0001] Perfect
Color:
lilac, light violet, or pink.
Density:
2.2
Diaphaniety:
Transparent to translucent
Habits:
Encrustations - Forms crust-like aggregates on matrix., Nodular - Tuberose forms having irregular protuberances over the surface., Micaceous - Platy texture with "flexible" plates.
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
pale violet blue
More details...