Hematite after Magnetite (variety martite)

Payún Matru Volcano, Malargüe, Malargüe Department, Mendoza Province  Argentina (2008)

Specimen size: 7.2 × 3.8 × 4 cm = 2.83” × 1.50” × 1.57”
Main crystal size: 2.5 × 2 cm = 0.98” × 0.79”