General Information:
Chemical Formula:
KFe+++3(SO4)2(OH)6
Composition:
(Molecular Weight = 500.81 gm)
Potassium 7.81 % K
Iron 33.45 % Fe
Hydrogen 1.21 % H
Sulfur 12.81 % S
Oxygen 44.73 % O
Empirical Formula:
KFe2+3(SO4)2(OH)6
Environment:
Secondary mineral, forming under conditions of weathering in arid climates.
Locality:
Barranco Jaroso in southern Spain.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[0001] Distinct
Color:
brown, yellow, yellow brown, or light yellow.
Density:
2.9 - 3.3, Average = 3.09
Diaphaniety:
Translucent
Habits:
Crystalline - Fine - Occurs as well-formed fine sized crystals., Fibrous - Crystals made up of fibers., Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
2.5-3.5 - Finger Nail-Copper Penny
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
yellow
More details...