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Voltaite with Coquimbite

#BAC62523

Voltaite with Coquimbite

#BAC62523
Availability
Sold
Size
4 x 3 x 2 cm - Miniature 
Formula
K2Fe2+5Fe3+3Al(SO4)12·18H2O (RRUFF)
Locality
Alcaparrosa mine, Cerritos Bayos, Calama, El Loa, Antofagasta, Chile

Glossy black octahedrons to 1mm in a matrix of purple Coquimbite and other sulfates. An unidentified pinkish brown mineral is shown in the fifth photo.

Voltaite

Formula
K2Fe2+5Fe3+3Al(SO4)12·18H2
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Crystalline - Fine 
Cleavage
None, None, None 
Luster
Silky 
Color
greenish black, dark green, olive green, black 
Streak
grayish green 
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
3-3.5 

Data courtesy of Webmineral.

Collection
William & Anne Cook Collection
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