Ferberite

Mount Chambillaya mining district, Quime, Inquisivi Province, La Paz Departament  Bolivia

Specimen size: 2.9 × 2.4 × 1.3 cm = 1.14” × 0.94” × 0.51”
Main crystal size: 2.2 × 2.1 cm = 0.87” × 0.83”