File:Olivine basalt.jpg

A rock (olivine basalt). Taken from :


 * Photographer: Siim Sepp


 * Date of the creation: 25th April, 2005.


 * Diameter is 14 cm.


 * Description: dark groundmass is basalt, orange is iddingsite (hydrothermally altered olivine) and black phenocrysts are augite (one of pyroxenes).


 * Rock sample is from La Palma, Canary islands and belongs to the University of Tartu.