RL78F8: A very attractive specimen, for both its perfect size, definition, and intense, metallic blue of the laminar crystals of Covellite, which contrast well with the small groups of Pyrite crystals. The locality is its second strong point: the classic mine of Calabona, Sardinia. It was bought in 1922.
Calabona Mine, Alghero, Sassari Province, Sardinia/Sardegna  Italy (±1920)

Specimen size: 5 × 4.3 × 4.2 cm = 1.97” × 1.69” × 1.65”