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Mineralpedia Details for Cobaltlotharmeyerite

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Cobaltlotharmeyerite

Cobaltlotharmeyerite

Named as the cobalt analogue of the mineral lotharmeyerite. A rare mineral that occurs as brown aggregates and thin tabular crystals in association with bariopharmacosiderite, arseniosiderite, and cobalt-bearing mawbyite and tsumcorite on dumps at the type locality near Schneeberg in Saxony, Germany. The only other localities for Cobaltlotharmeyerite is at Bou Azzer in Morocco.

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

Formula
CaCo2(AsO4)2ยท2H2
Crystal System
Monoclinic 
Crystal Habit
Aggregates, Fan Shaped, Lath 
Cleavage
None, None, None 
Luster
Vitreous - Adamantine 
Color
brown 
Streak
light brown 
Class
Monoclinic - Prismatic 
Hardness
4.5 
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Cobaltlotharmeyerite from Bou Azzer dist., Anti-Atlas, Morocco

Cobaltlotharmeyerite
            from Bou Azzer dist., Anti-Atlas, Morocco

Favreau et al (MR 38-5) notes that Cobaltlotharmeyerite from Bou Azzer is the best in the world. This specimen has tiny lustrous reddish brown lamellae perched upon oxidized rosettes of Hematite. Upon the Co-lotharmeyerite are also brilliant green micro crystals of Cobaltaustinite. Along the edge of the cavity in which the crystals occur you can also see the cross section of gistening Hematite which comprise the rosettes of the oxidized red Hematite.

Beautiful thin lamellae of Cobaltlotharmeyerite crystals perched upon and included within Calcite.

Click thumbnail images for larger view.

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