Mineral Specimen #3915 Eglestonite, Calomel, Cinnabar, minor Mercury
Challenge deposit, Emerald Lake Hills, San Mateo Co., California
(Hg+2)3Cl3O(OH) and (Hg+2)Cl2
Yellow orange Eglestonite which is mostly just a thin layer with some crude small crystalization in one area. Also present, is a crust of tan Calomel and bright red Cinnabar. There are a couple of very small globules of native Mercury best observed under 10x (
The specimen is composed of massive material.