groundmass

navigate by keyword : art bead boulder chain chalcedony contexts crystals differs erupted fine grained food formation formed gemstone geode geology grain groundmass igneous iron jewellery larger lava may metal mineral mineralogy necklace origin phenocrysts porphyritic rhyolite rock rocks scientific sculpture shortened silica rich silver soil stone texture volcanic volcanics volcano wood

Macro shot of brown dried Mexican fire barrel cactus (Ferocactus pilosus) with yellow flower in a centre Royalty Free Stock Photo

Child Playing On A Blue Slide In A Park On A Sunny Autumn Day Royalty Free Stock Photo

Constantly boiling Litli Geysir in Iceland Royalty Free Stock Photo

Strokkur geysir, Haukadalur valley, southwestern Iceland Royalty Free Stock Photo

Pedestrian crossing at Bologna, emilia and romagna, Italy Royalty Free Stock Photo

Little geysir, Haukadalur valley, southwestern Iceland Royalty Free Stock Photo

Autumn Leaves With Dew Drops On Sandstone Ground In Quiet Park Pathway, Golden Morning Royalty Free Stock Photo

Rhyolite is the most silica-rich volcanic rock. May be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained groundmass. Volcanic rock is a rock formed from lava erupted from a volcano. It differs from other igneous rock by being of volcanic origin.