North and Central Americas United States Utah 3654 Weeksite, Opal, Autunite No 8 Claim, Thomas Mountains, Juab Co, Utah, USA April 27, 2023
Australasia Australia South Australia 2836 Opal (Shell), Coober Pedy, South Australia October 3, 2019
Australasia Australia New South Wales 1349 Clinochlore, Opal (Hyalite), Mt Lightning, near Coolac, New South Wales September 22, 2019
