Description: Calcite Perry Pit, west side, California hill, Mariposa Mine, California Hill, Terlingua Mercury District, Brewster County, Texas, USA 3.5 cm long. Calcite, scalenohedral and zoned. Perry Pit, west side, California hill, Mariposa Mine, Terlingua Mercury district, Brewster County, Texas. 3.5 cm long. Crystals like this one are common in the district, often display planes along which dustings of cinnabar have grown. This one shows a thin coating of clay along an earlier crystal face.

All pictures, text, design © Forum FMF 2006-2024