Photo & Collection: Serge Lavarde.

Erythrite | ‪#‎Geology

Erythrite or red cobalt is a secondary hydrated cobalt arsenate mineral with the formula Co ₃ ₂•8H ₂O. Erythrite and annabergite, chemical formula ₂•8H ₂O, or nickel arsenate form a complete series with the general formula ₃ ₂•8H ₂O. Erythrite crystallizes in the monoclinic system and forms prismatic crystals.
 
System: Monoclinic
Colour: Crimson to peach red, ...
Hardness: 1½ - 2½
Member of: Vivianite Group
Name: Named in 1832 by Francois Sulpice Beaudant From the Greek έρυθρος for red.

From Ightem, Bou Azer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco.


 
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