Adamite is an uncommon zinc hydroxyarsenate mineral (Zn2(AsO4)(OH)). It typically has a yellowish color (with a greenish tint), but the presence of impurities do result in other colors, for example green and purple. Most collector-grade adamite specimens come from Mexico's Ojuela Mine. Adamite in this part of the world occurs in oxidized carbonate replacement deposits. Such deposits are folded Cretaceous carbonates subsequently mineralized by hydrothermal-magmatic fluids and then subjected to near-surface oxidative weathering.
Adamite (field of view ~4.8 cm across)- yellowish crystal fans of adamite from the Ojuela Mine, Mapimí, northeastern Durango State, northern Mexico.