Sternbergite with Proustite

Unknown Owner

Sternbergite is a rare silver iron sulfide mineral with the formula AgFe2S3, typically forming dark gray to black metallic crystals or lamellar aggregates in hydrothermal silver deposits. It crystallizes in the orthorhombic system and is usually found in association with other silver sulfides and sulfosalts. First described in 1814 and named after Count Kaspar Maria von Sternberg, it occurs in classic localities such as the Erzgebirge region of Germany and the Czech Republic and is primarily of interest to mineral collectors and researchers studying silver ore mineralogy. This is a choice example with metallic sternbergite as micro crystals very rich across the top of matrix with micro proustite. This is in very good condition. The specimen comes with an antique label as shown at the end of the video dating this to the very early 20th century. This is from a very classic locality. Johanngeorgenstadt, in Saxony near the Czech border, was founded in 1654 following the discovery of rich silver deposits in the Erzgebirge. Silver mining drove its early growth and prosperity, and the district later became important for tin and cobalt extraction. In the 20th century, the area was heavily mined for uranium by the Soviet German Wismut company after World War II, making it one of the major uranium producing regions in East Germany before mining declined and eventually ceased.