2.3" Cobaltaustinite on Cobalt-Bearing Dolomite - Aghbar Mine, Morocco

This is a beautiful association of green cobaltaustinite aggregates that formed over cobalt-bearing dolomite, collected from the Aghbar Mine in the Drâa-Tafilalet Region of Morocco.

Dolomite is an anhydrous carbonate mineral composed of calcium magnesium carbonate—CaMg(CO3)2.

The mineral dolomite crystallizes in the trigonal-rhombohedral system. It forms white, tan, gray, or pink crystals. Dolomite is a double carbonate, having an alternating structural arrangement of calcium and magnesium ions. It does not rapidly dissolve in dilute hydrochloric acid as calcite does. Crystal twinning is common.

The mineral dolomite was first described by Carl Linnaeus in 1768 and In 1791, it was described as a rock by the French naturalist and geologist Déodat Gratet de Dolomieu who first recognized the material in buildings of the old city of Rome, and later as samples collected in the mountains known as the Dolomite Alps of northern Italy.

Cobaltaustinite & Dolomite var. Cobalt Dolomite
Aghbar Mine, Aghbar, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco
2.3 x 1.8"