Mineral: Calcite
Locality: Denton Mine, Rosiclare formation, Goose Creek Mine group, Harris Creek Sub-District, Hardin County, Illinois, USA
Dimensions: 6.7 x 5 x 4 cm / main crystal: 3.9 cm.

Description: Mass: 140 g MIM number: 1432 Probable year of extraction : 1987 Piece of fluorite on which several calcite crystals have developed, the largest of which has grown parallel to the fluorite. These crystals are all cask-shaped pseudo-hexagonal prisms with a modification at the summit in the form of a hat with 3 sides at equal angles of one another, giving each calcite the appearance of a mushroom. The entire sample is sprinkled with small chalcopyrite crystals. Photographer: FMI / James Elliott; Ex collection: Ross C. Lillie (USA)

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