Gemmy, Green Adamite Crystals - Durango, Mexico

This is a beautiful specimen of gemmy, yellow/green Adamite crystals on a limonite matrix from the Ojuela Mine in Durango, Mexico. The crystals of very vibrant in person and forms small pinweels that combine into a 1.9" wide cluster. Fantastic color and luster on this exceptional specimen.

Adamite is a basic zinc arsenate with the base chemical formula of Zn2(AsO4)(OH). When impurities are present in the mineral, the color is altered, explaining the wide variety of colors that adamite displays. Copper and cobalt are some well-known impurities that can give mineral specimens a green (Cu) to pink/red (Co) color. Adamite is typically found imbedded in a limonite matrix, formed as a secondary mineral in oxidation zones of hydrothermal replacement deposits.
Ojuela Mine (Level 4), Mapimi, Durango, Mexico
Matrix 2.3x1.7", Cluster 1.9" wide