3.5" Roselite Crystal Clusters on Cobaltoan Calcite - Morocco

This specimen contains small roselite crystal clusters scattered atop a cobaltoan calcite crystal cluster, collected from the Agoudal Mine in Morocco.

Cobaltoan calcite, also known as cobaltocalcite, is one of many different varieties of calcite, forming with a chemical composition of (Ca,Co)CO3. It crystallizes in a trigonal crystal system and forms rhombohedral or scalenohedral crystals. These crystals tend to display a pink color of which intensity can range anywhere from a pinkish-salmon to a hot pink.

Roselite is a monoclinic mineral of the hydrated phosphates group, and has a chemical formula of Ca2Co(AsO4)2 · 2H2O. It gained its name not from the rose color that is generally exhibited by the mineral, but was in fact named in honor of a German mineralogist by the name of Gustav Rose. However, the name is quite fitting, for roselite typically displays a vitreous rose-red to pink color. Darker colored crystals have been known to frequently display marked color zoning due to variations in molecular composition.

Calcite var. Cobaltoan Calcite & Roselite
Agoudal Mine, Bou Azzer, Morocco
3.5 x 2.1"