4.7" Lustrous Calcite Crystal Cluster with Pyrite - Fluorescent!

Lustrous Calcite Crystal Cluster with Pyrite - Fluorescent! #219533

This is a gorgeous cluster of lustrous calcite crystals that formed in association with pyrite crystals. Most of the pyrite can be found on what could be considered the underside of the specimen. It was collected from the El Hammam Mine in the Khémisset Province of Morocco. Under short-wave ultraviolet light, the calcite crystals exhibit vibrant orange fluorescence.

It comes with an acrylic display stand.

Calcite, CaCO3, is a carbonate mineral and the most stable polymorph of calcium carbonate. The other polymorphs are the minerals aragonite and vaterite. Calcite crystals are trigonal-rhombohedral, though actual calcite rhombohedra are rare as natural crystals. However, they show a remarkable variety of habits including acute to obtuse rhombohedra, tabular forms, and prisms. Calcite exhibits several twinning types adding to the variety of observed forms. It may occur as fibrous, granular, lamellar, or compact. Cleavage is usually in three directions parallel to the rhombohedron form.

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