Tephra, ash, pumice, scoria, patter, lava bomb rock, Iceland
Avatar

Tephra, ash, pumice, scoria, patter, lava bomb rock, Iceland

by Ragnar Sigurdsson (arctic-images.com), Iceland

Lava rock is coloured by oxidized iron in the rock. Higher resolution images available from rth@arctic-images.com (there is a licensing fee depending on the use).