Manganite

Caland Mine, Steep Rock Lake, Atikokan area, Rainy River District, Ontario  Canada (±1978)

Specimen size: 9 × 7.5 × 4.4 cm = 3.54” × 2.95” × 1.73”
Main crystal size: 1 × 0.5 cm = 0.39” × 0.20”