Acanthite

Hongda Mine, Xiaoqinggou, Lingqiu, Datong Prefecture, Shanxi Province  China (08/2016)

Specimen size: 8.6 × 6.2 × 4 cm = 3.39” × 2.44” × 1.57”
Main crystal size: 2.5 × 1.7 cm = 0.98” × 0.67”