General Information:
Chemical Formula:
K3Cu3(Fe+++,Al)O2(SO4)4
Composition:
(Molecular Weight = 765.60 gm)
Potassium 15.32 % K
Aluminum 1.76 % Al
Iron 3.65 % Fe
Copper 24.90 % Cu
Sulfur 16.75 % S
Oxygen 37.62 % O
Empirical Formula:
K3Cu3Fe3+0.5Al0.5O2(SO4)4
Environment:
Volcanic fumaroles.
IMA Status:
Approved IMA
Locality:
Great Tolbachik fissure eruption, Kamchatka, Russia.
Name Origin:
Named after the locality.
Physical Properties:
Cleavage:
[???] Perfect
Color:
dark green or olive green.
Density:
3 - 3.15, Average = 3.07
Habits:
Acicular - Occurs as needle-like crystals., Aggregates - Made of numerous individual crystals or clusters.,
Hardness:
2.5 - Finger Nail
Luster:
Sub Metallic
Streak:
green light
More details...