Heinrichite & Metaheinrichite - Near Lakeview, Lake County, Oregon, USA (TL)

Ba(UO₂)₂(AsO₄)₂ · 10H₂O    Ba(UO₂)₂(AsO₄)₂ · 8H₂O

Heinrichite and metaheinrichite, two uranium arsenate minerals, are notable finds from near Lakeview in Lake County, Oregon. Heinrichite, a bright yellow-green hydrated barium uranium arsenate, typically occurs as crystalline crusts or small, radiating aggregates on host rocks. Its vibrant color and rarity make it a highly sought-after specimen among collectors. This mineral forms under oxidizing conditions in uranium-rich environments, where arsenic-bearing solutions interact with uranium minerals. Near Lakeview, heinrichite is associated with secondary uranium mineralization in volcanic tuffs, showcasing the unique geological processes of the region.

Metaheinrichite, a related mineral and the dehydrated form of heinrichite, shares similar bright yellow-green hues but often has a duller appearance and powdery texture. It forms as a result of further oxidation and dehydration of heinrichite, reflecting the changing geochemical conditions in the area. Specimens of heinrichite and metaheinrichite from the Lakeview area are particularly valued for their well-formed crystals and vivid coloration. These minerals not only provide insight into the oxidation and mobility of uranium and arsenic in volcanic environments but also highlight the diversity of uranium mineralogy in Oregon's unique geological setting.

Approx activity: 2600 cpm

Approx. size: 65mm x 60mm x 35mm