Hübnerite

Yaogangxian Mine, level 37, Yizhang, Chenzhou Prefecture, Hunan Province  China (2004)

Specimen size: 6.7 × 4 × 0.8 cm = 2.64” × 1.57” × 0.31”
Main crystal size: 6.7 × 2.3 cm = 2.64” × 0.91”