Mineral: Fluorite, Calcite
Locality: Denton Mine, Rosiclare formation, Goose Creek Mine group, Harris Creek Sub-District, Hardin County, Illinois, USA
Dimensions: 22 x 19 x 12 cm / main crystal: 5.4 cm.

Description: Mass: 3750 g MIM number: 1440 Probable year of extraction : 1991 Large, thin, convex sheet covered with well formed transparent crystals of a deep blue color with lustrous faces, and "phantoms" at the center of each cube. Small, elongated calcite crystals of a cream color stud the sheet. Photographer: FMI / James Elliott; Ex collection: Ross C. Lillie (USA)

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