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Hallimondite - Sold

Hallimondite is a hydrous lead uranyl arsenate. Walenta (1965) named the species in honor of English mineralogist Arthur Francis Hallimond (1890-1968), who studied secondary uranium minerals, and greatly advanced the development of the reflected light microscope.

Hallimondite forms orange non-fluorescent patches to 4 mm on rhyolite. A fluorescent uranium mineral, likely metaheinrichite, is also present in greater amounts. From the collection of E.R. Laskowski (1949-2020), a mining engineer who retired to Tucson, Arizona. This specimen hails from the earlier collections of Steve Pullman and Stan Alexander.