This silver on calcite is from Batopilas in the Andres del Rio District, Chihuahua, Mexico. This location has been mined since 1632 when the conquistadores first started exploiting the deposits. Production continues to this day. This specimen consists of a calcite matrix that is sandwiched between veins of acanthite. The host matrix is white calcite and it contains silver in the form of crystals, wires, and complex crystal formations. This piece measures 1 1/8 x 1 1/8 x 15/16 inches or 28 x 28 x 23 mm.