Basalt bomb
Kenyte lava
Diorite intruded by microgranite
Hornblende-biotite granite
Quartz-feldspar porphyry
Banded gneiss
Marum volcano, Vanuatu
Sample of basalt
Aa lava, Pacaya, Guatemala
Obsidian-rich lava flow, Tenerife
Obsidian lava
Obsidian rock
West Mata underwater volcano
Volcanic rocks
Kambhorn reflected in lagoon, Iceland
Skjaldbreidur shield volcano, Iceland
Nyiragongo volcano, Congo
Volcanic eruption
Volcanic eruption, Reunion Island
Sample of granite
Eruption of Mount Batu Tara, August 2011
Basalt columns
La Tarta volcanic outcrop, Tenerife
Lava falls during Kilauea eruption, 1969
Lava flow
New island formed by Hunga Tonga volcano, 2017
Basaltic lava flow, New Mexico, USA
Vesicular basalt
Eruption of Fuego volcano, November 2016
Erta Ale volcano, Congo
Sample of biotite
Pegmatite specimen
Tuff specimen
Biotite
Biotite, Tyringham, Massachusetts, USA
Rhyolite, Mexico
Banded rhyolite
Basalt, Massachusetts, USA
Fossil fern trunk
Descloizite
Pink-white chabazite in basalt groundmass
Basalt outcrop
Obsidian mineral stone
Volcanic landscapes in Western Iceland.
Basalt pavement, Iceland
Lava fountain during Kilauea eruption, 1969
Lava fountain during Kilauea eruption, 1959
Volcanic lava delta
Volcan de Fuego erupting at night, Guatemala
Smoke and light coming through crack in lava rock, elevated view
Cutaway model of the Earth's core
Rhyolite
Trachyte
Aggregate of muscovite crystals
Tuff rock with graded bedding
Lava flow, deep sea vent
Volcanic rock
Eruption of Momotombo volcano, February 2016
Olivine inclusion in basalt
Volcanic crater
Tangaroan volcanic eruption, artwork
Santiago crater lava lake, Masaya caldera, Nicaragua
Sample of sandstone
Sample of limestone
Fossil Sphenophyllum plant
Gymnosperm fossil
Fossil conifer leaf
Fossil leaf
Fossil fern frond
Fossil cycad leaves
Geothermal hot spring vents, Ethiopia
Reddish pink apophyllite crystal and basalt groundmass
Olivine mineral sample
Algae in geothermal pool
Algae in geothermal pool, New Zealand
Amygdaloidal basalt
Mount Etna erupting at night, 2012
Mount Etna erupting, 2012
Mount Bromo erupting, Indonesia, 2011
Fluorite
Tiger eye
Zoisite in pegmatite groundmass
Storage of fossil specimens
Sample of andesite
Summit crater of Hverfjall volcano, Iceland
East Pacific Rise, topographic map
Venus, synthetic aperture radar map
Mount Vesuvius erupting, 1944
Wake through a pumice raft, Tonga, 2006
Sample of muscovite
Obsidian, a glassy igneous rock
Rhyolite specimen
Obsidian
Variety of Igneous Rocks
Muscovite Mica, Ontario, Canada
Muscovite Mica
Lepidolite, Newry, Maine, USA
Pegmatite, New Hampshire, USA
Scoria, Oregon, USA
Green Tourmaline in Muscovite, Maine
Muscovite Star Mica
Brazilianite crystals in calcite
Mahogany obsidian
Basaltic dyke rock
Cut and polished septarian nodule
Pyroclastic rock
Tourmaline pegmatite
Blue Hauyne crystals in lava groundmass
Biotite in rock groundmass
Sanidine on trachyte lava groundmass
Snowflake Obisidian
Tourmaline Pegmatite
Muscovite crystals in rock groundmass
Bozen quartz porphyry, South Tyrol, Italy
Axinite
Sample of shale
Homo sapiens skull comparison
Fractured pillow lava, deep sea vent