Stibnite

McLaughlin Mine, Knoxville, Knoxville District, Napa County, California  USA

Specimen size: 6.6 × 4.9 × 2.1 cm = 2.60” × 1.93” × 0.83”
Main crystal size: 2.4 × 0.2 cm = 0.94” × 0.08”