16hhsh.ir ((GYPSUM on SMITHSONITE and CALCITE)), $20 MINIMUM BID, Hidden Treasure Mine, Tooele County, Utah, 11 x 9 x 1.5 cm, Cabinet | |
One side is Smithsonite coated with Gypsum and the other side is Calcite coated with Gypsum. Gypsum is a thin lustrous, shiny layer easily seen when hit by light. ex Solon Hammack circa 1990 |