Calcite.

Calcite.

Calcite, CaCO3, Calcium carbonate is a mineral that is very common in all geological environments. This fist sized specimen is from a mining area in Shropshire. I was walking across a farmers field near Rorington mine, Shelve area of Shropshire, when I stumbled across this specimen. This was about a quarter of a mile from the old mine, and is the only specimen that I found on that day. The major rhomboid crystals have a slight pinkish hue and are totally covered by thousands of minute calcite crystals, and a minor peppering of an unknown black mineral.