Komatiite
Rock
About it
Ancient magnesium-rich ultramafic lava, often with spinifex texture of long, bladed olivine crystals. Nearly all of it is over 2.5 billion years old; named for the Komati River, South Africa, and well exposed in Munro Township, Ontario.
- Type
- Rock (igneous)
- Group
- Igneous (ultramafic volcanic)
- Colours
- dark green, greenish black, grey
- Transparency
- opaque
Typical values: real specimens vary. For more, see mindat.org.