Mineral: Crichtonite on Feldspar (Group)
Locality: Grand Châtelard Massif, Sainte-Marie-de-Cuines, Saint-Jean-de-Maurienne, Savoie, Auvergne-Rhône-Alpes, France
Dimensions: 6 x 2 x 4 cm / main crystal: 1.4 cm.

Description: Mass: 50 g MIM number: 1412 Well formed, lustrous black crystal with beveled corners on a matrix of small, cream-colored tablets of feldspar (sample discovered by the mineralogist Lilian Schaub). Photographer: AINU / Augustin de Valence; Publication: "Minéraux - Le Guide des Passionnés" Ex collection: Gilles Emringer (France)

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