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RM1874   Talmessite with cobaltoan calcite

Aghbar Mine, Aghbar, Bou Azzer, Tazenakht, Ouarzazate, Morocco

Interesting specimen formed by several aggregates of tabular talmessite crystals, standing out on the calcite matrix. In order to confirm the species, we carried out a chemical analysis using SEM-EDS, which confirms the presence of Ca and Mg and the almost absence of Co, consistent with talmessite or wendwilsonite. On the other hand, X-ray diffraction confirms talmessite. Performing this structural (XRD) and compositional analysis (SEM-EDS) allows us to delimit the species. Spheroidal aggregates of slightly curved faces and edges. Color and luster are magnificent for the species and contrast on a base of small slightly pink crystals of calcite (Mn), on matrix. We'll send a the analysis to the buyer.

Size: 6.8 x 4.8 x 4.7 cm.
Main crystal: 3 mm. aggr.
Found in 2017.

Fluorescent under long wave UV