ncat WD113 Cassiterite, Hyalite, Erongo Mountains, Karibib, Erongo, Namibia October 29, 2020 Pendleton Africa Namibia Nice sharp group of cassiterite crystals with a partial coating of fluorescent green hyalite opal. The hyalite fluoresces under longwave UV (Convoy) but is much brighter under shortwave. The green fluorescence is due to uranyl ions.
Michigan North and Central Americas United States 2426 Algodonite, Mohawk Mine, Keweenaw Co, Michigan, USA September 22, 2019
California North and Central Americas United States 5319 Ulexite, Borate, near Calico, San Bernadino Co., California September 29, 2019