Mineral: Calcite
Locality: Denton Mine, Rosiclare formation, Goose Creek Mine group, Harris Creek Sub-District, Hardin County, Illinois, USA
Dimensions: 5 x 6.2 x 5 cm / main crystal: 3.5 cm.

Description: Mass: 93 g MIM number: 1433 Probable year of extraction : 1987 Piece of fluorite on which several calcite crystals have developed, the largest of which has grown perpendicularly to the fluorite. These crystals are all cask-shaped pesudo-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 studded with small chalcopyrite crystals. Photographer: FMI / James Elliott; Publication: "101 Minéraux et Pierres Précieuses qu'il faut avoir vus dans sa vie" Ex collection: Ross C. Lillie (USA)

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