Hematite after Magnetite (variety martite)

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

Specimen size: 7.5 × 4 × 3.6 cm = 2.95” × 1.57” × 1.42”
Main crystal size: 3.8 × 3 cm = 1.50” × 1.18”