Olivine_basalt.jpg (120KB, MIME tüüp: image/jpeg)
image/jpeg
This is a file from the Wikimedia Commons. The description on its description page there is copied below.
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.
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