Mineral Species: Calcite 

Chemical Formula: CaCO3

Chemical Name: Calcium Carbonate

Mineral Class: Carbonate

Mineral Notes: Calcite is one of the commonest minerals, being the main constituent of limestone. Calcite is often fluorescent, a small amount of Managnese is enough to make it glow red under UV light. The mineral will bubble in acid distinguishing it from many similar species, even other carbonates which do not dissolve so easily in cold acids. 

Description: A very unusual formation of Calcite. The mineral forms a spherical flattened disk. Close examination shows that this is made from very thin, overlapping crystals. Adjacent to this formations are two smaller part-formed disks. The group is attached to a Quartz matrix, whose top surface is covered by small, grainy, very lustrous Pyrite crystals.

Location: Al Hamman, Morocco.