Mineral: Genthelvite with Quartz
Locality: Hexigten Banner (Kèshíkèténg Qí), Chifeng (Ulanhad), Inner Mongolia Autonomous Region, China
Dimensions: 6 x 5 x 5 cm / main crystal: 1.6 cm

Description: Mass: 99 g MIM number: 1342 Group of imbricated, well formed, lustrous, brown tetrahedrons topped by a crown of small, colorless quartz crystals. The crystals consist in theory of genthelvite overgrowing a helvite core. Photographer: FMI / James Elliott; Publications: "Mineralogical Record: Sep-Oct 2012", "China II, Mineralien, Fundorte, Lagerstätten"

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