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RM823   Opal with gypsum

Galera, Granada, AndalucĂ­a, Spain

A curiosity that I found aesthetic and mineralogically interesting. Usually the menilite opals are found in a marlstone matrix, but in this case we found it included in gypsum with clay inclusions. A Spanish curious specimen...

Size: 9,5 x 6,5 x 4,0 cm.
Main crystal: 14 x 13 mm (diam.).