Alacranite was first found in the Uzon Caldera, Russia. The Uzon caldera is located near the eastern volcanic belt of the Kamchatka peninsula. The area is a basaltic shield volcano with lacustrine sediments, faulting and extension, dome formation and hydrothermal fluids from hot springs within the caldera. Amounts of realgar, stibnite, cinnabar and pyrite are contained in sediments near active hot springs.