Mineral: Opal-CT (variety lussatite)
Locality: Lussat, Aigueperse, Riom, Puy-de-Dôme Department, Auvergne-Rhône-Alpes, France
Dimensions: 12 x 10 x 10 mm

Description: Lussat is the type locality for Opal-CT. C stands for Cristobalite and T stands for Tridymite.

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