Calcite Crystals on Yellow-Green Adamite - Durango, Mexico

This is a beautiful specimen of double terminated calcite crystals on yellow-green Adamite from the Ojuela Mine in Durango, Mexico. The fanning of adamite crystal formations can be found on top of the red limonite matrix.

Under short-wave UV, this specimen fluoresces a bright green color. This specimen comes with an acrylic display stand.

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.

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