This acanthite is from Porco in Agua de Castilla, Antonio Quijarro Province, Potosi Department, Bolivia. This area encompasses hundreds of square kilometers that contain intrusions and deposits of over one hundred different mineral species. Including acanthite which is a silver sulfide. It is mined primarily for silver, zinc, tin, lead and other associated ore minerals. This is a piece of massive acanthite that contains some micro native silver wires and minor associated silver sulfides. It measures approximately 5 1/8 x 3 x 3 1/4 inches or 130 x 76 x 82 mm. It wieghs over 4 pounds.