3692 Tungstite, Adams Mine (Adams Tunnel Mine), Cement Creek, Eureka Mining District, San Juan Co., Colorado, USA October 27, 2019 Steve Colorado North and Central Americas United States Pale yellow crust on quartz. Not listed in Mindat, but hubnerite is. According to Rock Currier, almost all hubnerite specimens from this mine have been etched out of quartz using hydrofluoric acid. Click for full sized image…