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Komatiite

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HAN957731

Komatiite

Type Locality

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Description
Locality: 
Barberton, Ehlanzeni District, Mpumalanga Province, South Africa
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.2 × 6 × 2.8 cm
Weight: 
46.00gr
Description

A cut end piece with rough back. Typical green spinifex texture shows on the cut surface

Komatiites are rare rocks; almost all komatiites were formed during the Archaean Eon (4.0–2.5 billion years ago), with few younger (Proterozoic or Phanerozoic) examples known. This restriction in age is thought to be due to cooling of the mantle, which may have been 100–250 °C (212–482 °F) hotter during the Archaean.

 Komatiite is an ultramafic, high-magnesian volcanic rock typical of a spinifex texture originated during fast cooling of a silicate melt enriched in olivine and other Mg-Fe silicates.  Komatiites occur in old south-African cratons around the Komati river, from where the rock was described for the first time.

 

Mineral Data
What's on the rock

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