General Information:
Chemical Formula:
AlSO4(OH,F)·5(H2O)
Composition:
(Molecular Weight = 230.53 gm)
Aluminum 11.70 % Al
Hydrogen 4.72 % H
Sulfur 13.91 % S
Oxygen 68.02 % O
Fluorine 1.65 % F
Empirical Formula:
AlSO4OH0.8F0.2·5(H2O)
Environment:
Burning mine waste heaps with copiapite and ammonia alum. Dimorphous with jurbanite, compare khademite.
Locality:
TL: Schoeller Coal Mine, Libusin, Kladno district, Bohemia, Czech Republic.
Name Origin:
Named for Rudolph Rost (1912-), Czech mineralogist.
Physical Properties:
Color:
white.
Density:
1.892
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).,
Streak:
white
More details...