Hematite after Magnetite (variety martite)

Payún Matru Volcano, Malargüe, Malargüe Department, Mendoza Province  Argentina (04/2007)

Specimen size: 9.1 × 10.3 × 7.7 cm = 3.58” × 4.06” × 3.03”
Main crystal size: 3.5 × 3.3 cm = 1.38” × 1.30”