specimen of andesite extrusive igneous rock stone a hand.

andesite art asphalt attach background ballast bedrock black boulder carbon civil close-up coal contexts crush engineer engineer39aph39s erupted extrusive floor flooring formation formed fossil fragment fuel geology granite hand hard igneous intrusive iron jewellery lava macro mineral natural nature object ore pattern paving plutonic rail railway raw rhyolite rock rough scientific shortened sleepers soil solid specimen stone stones stonewall terrain texture used volcanic volcanics volcano wall white wood