Erythrite is a distinctly colored mineral, its deep red-purple to pink coloring a result of its Cobalt content. As a secondary mineral, it forms in the oxidation zone of Cobalt-bearing ore. Referred to as “Cobalt bloom” and “Red Cobalt” by miners, this crimson mineral was an unmistakeable clue used to discover new veins of cobalt ore. Add a vitreous to pearly luster to its striking color and you have a highly collectible mineral. It is often associated with Quartz, Silver, Azurite, Cobaltite and Calcite.

The crystal system for Erythrite is monoclinic, typically forming radiating, acicular or fibrous aggregates and microcrystalline crusts. Other forms include botryoidal, globular shapes with druzy coatings, earthy and massive. Crystals, though rare, are generally thin and bladed, often striated.

There are limited localities for quality Erythrite specimens. Notable locations include Australia, Canada, Germany, Mexico and Morocco.