Comendite

Comendite
Comendite at Lookout 589 in the Glass House Mountains

Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite. Phenocrysts are sodic sanidine with minor albite and bipyrimidal quartz.[1] Comendite occurs in the mountains Tibrogargan, Coonowrin, Tunbubudla, Coochin, Saddleback, Tibberoowuccum and Ngungun in the Glass House Mountains, South East Queensland, Australia. The blue colour is caused by very small crystals of riebeckite or arfvedsonite. [2] Comendite also occurs in Sardinia, Corsica, Ascension Island, Ethiopia, Somalia and other areas of East Africa.[1]

References

  1. ^ a b Iddings, Joseph Paxson, 1913, Igneous rocks: composition, texture and classification, v. 2, pp. 94-96
  2. ^ Rocks and landscapes of the Sunshine Coast by Warwick Willmott, Brisbane: Geological Society of Australia Queensland Division, 2007
Stub icon This article related to petrology is a stub. You can help Wikipedia by expanding it.