General Information:
Chemical Formula:
KFe+++(SO4)2
Composition:
(Molecular Weight = 287.07 gm)
Potassium 13.62 % K
Iron 19.45 % Fe
Sulfur 22.34 % S
Oxygen 44.59 % O
Empirical Formula:
KFe3+(SO4)2
Environment:
Crystal aggregates coating rubble with other secondary sulfates.
IMA Status:
Approved IMA 1959
Locality:
United Verde Extension mine, Jerome, Arizona, USA.
Name Origin:
Named for the Yavapai Indian tribe that inhabited the area of Arizona where the mineral was found.
Physical Properties:
Cleavage:
[001] Perfect, [100] Perfect, [110] Distinct
Color:
light pink.
Density:
2.88
Diaphaniety:
Transparent
Habits:
Acicular - Occurs as needle-like crystals., Microscopic Crystals - Crystals visible only with microscopes.,
Hardness:
2.5-3 - Finger Nail-Calcite
Luster:
Vitreous (Glassy)
Streak:
yellow white
More details...