Hematite after Magnetite (variety martite)

Payún Matru Volcano, Malargüe, Malargüe Department, Mendoza Province  Argentina

Specimen size: 10.9 × 7.6 × 5.7 cm = 4.29” × 2.99” × 2.24”
Main crystal size: 7 × 5 cm = 2.76” × 1.97”