Blocky Colemanite Crystals
John Betts - Fine Minerals
Large blocky crystals of translucent, lustrous Colemanite fully crystallized on all surfaces with no point of attachment. A classic find from the early 1970s. See article: Colemanite from the Thompson Mine in Mineralogical Record v.5 #2. Ex. Frank Dudas collection RN79.
Thompson Mine, near Ryan, Death Valley, Inyo County, California