Davidlloydite

Davidlloydite, IMA 2011-053, was discovered on a specimen purchased by the Royal Ontario Museum in 2003 and formerly in the possession of American mineral dealer Charlie Key. It is an hydrated zinc arsenate, related to parahopeite of which it is the arsenate analogue (Hawthorne et al. 2012). It is named for David Lloyd (b.1943), a British mineral collector who has contributed extensively to mineralogy through his collecting activities in Britain and internationally, including at Tsumeb. Type material is conserved at the Royal Ontario Museum (catalogue number M56120).

Davidlloydite occurs as minute but elongated prismatic crystals (to 100 μm), flattened on {010}. The crystals are colourless with a vitreous lustre forming aggregates (to 0.5 mm) of sub-parallel to slightly divergent individuals on, and partly embedded in powdery calcioandyrobertsite (Hawthorne et al. 2012).

calcioandyrobertsite; geminite; stranskiite; zincolivenite