Image: Komatiite (weathered surface)
Komatiite (weathered surface) (9 cm x 6cm). Spinifex Creek, Baadplas, Mpumalanga Province, South Africa.
- Stuart Humphreys
- © Australian Museum
Komatiite is high in magnesium and crystallised at high temperatures. It commonly displays a spinifex (spiky grass) texture consisting of intergrown skeletal and bladed olivine and pyroxene crystals in a glassy groundmass. Most are Archean in age.