Calcite
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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 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.
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