Hematite after Magnetite (variety martite)

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

Specimen size: 11.7 × 8.9 × 6.1 cm = 4.61” × 3.50” × 2.40”
Main crystal size: 6 × 3.9 cm = 2.36” × 1.54”