Pyrargyrite with Calcite

An incredibly rich specimen of the silver sulphantimonide Pyrargyrite, occurring as crystals to around 7 mm across which richly encompass a matrix of light grey rhombic Calcite crystals.  From the famous Samson Mine, close to St. Andreasberg in the Harz Mountains of Lower Saxony, Germany, the Pyrargyrite crystals form lustrous, silver-black complex crystals, some displaying onion-skin layering following part dissolution and in places are deep blood-red.  A classic specimen of Pyrargyrite with many large well-formed crystals from St. Andreasberg.