General Information:
Chemical Formula:
H8K2Tl2(SO4)8·11(H2O)
Composition:
(Molecular Weight = 1,461.70 gm)
Potassium 5.35 % K
Thallium 27.97 % Tl
Hydrogen 2.07 % H
Sulfur 17.55 % S
Oxygen 47.07 % O
Empirical Formula:
H8K2Tl2(SO4)8·11(H2O)
Environment:
In the oxidation zone of a silver-bearing lead-zinc deposit. Found in geodes of marcasite and barite.
IMA Status:
Approved IMA 1968
Locality:
Baia Sprie, Baia Mare region, Romania.
Name Origin:
From the Latin 'Mons Medius', for Baia Sprie, Romania, the locality for the mineral.
Physical Properties:
Cleavage:
[???] Good, [???] Good
Color:
dark green or black.
Density:
3
Diaphaniety:
Subopaque
Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., ,
Hardness:
2 - Gypsum
Luster:
Resinous
Streak:
dark green
More details...