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Mineralpedia Details for Cobaltarthurite

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Cobaltarthurite

Cobaltarthurite

Named as the cobalt analogue of the mineral arthurite. Cobaltarthurite is a rare mineral that occurs on at the type locality at the Dolores prospect in Murcia, Spain and one other at Bou Azzer in Morocco. It occurs at the type locality in pellet-like spheres of straw-colored radial aggregates in association with olivenite, jarosite, and other oxidation products within a sulfide-depleted lens.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)

Formula
CoFe+32(AsO4)2(OH)2ยท4H2
Crystal System
Monoclinic 
Crystal Habit
Globular, Oolitic, Massive 
Cleavage
None, None, None 
Luster
Vitreous - Silky 
Color
straw yellow, dark brown 
Streak
light brownish white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
3.5-4 
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Cobaltarthurite from Dolores prospect, Pastrana, Mazarrón-Águilas, Murcia, Spain

Cobaltarthurite
            from Dolores prospect, Pastrana, Mazarrón-Águilas, Murcia, Spain

Golden brown radial-acicular crystal sprays to about 0.3mm.

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