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You are in > Home > Minerals > RM1857 Talmessite with cobaltoan calcite

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RM1857   Talmessite with cobaltoan calcite
Agoudal, Bou Azzer, Ouarzazate, Drâa-Tafilalet, Morocco
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Very curious globular aggregates formed by prismatic crystals that vary their composition according to the zone, although the XR diffraction study shows that it is talmessite, without discarding that in some parts of the aggregate a higher cobalt content is observed. These aggregates are disposed on a matrix of cobaltoan calcite, together with manganese oxides. Very interesting.


Size: 6.8 x 5.5 x 3.6 cm.
Main crystal: 12 x 11 mm aggr.
Found in 2018.



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