1.35" Polished White Magnesite Egg - South Africa

Magnesite is a magnesium carbonate mineral and a primary source of magnesium. It's a member of the calcite group of carbonate minerals, typically displaying a chalky white color, however it can also be gray, brown, yellow, orange, pale pink, or colorless. Magnesite is used in many ways, including use as a refractory material, as a catalyst, a filler in the production of synthetic rubber, and in the preparation of magnesium chemicals and fertilizers.

chemical formula: MgCO3