2.2" Roselite Crystals on Cobaltoan Calcite - Morocco

This specimen contains small roselite crystals scattered atop a small pocket of cobaltoan calcite crystals, collected from the Agoudal Mine in Morocco. Black dendrite formations cover the host rock.

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
2.2" wide