Marum volcano, Vanuatu
Nyiragongo volcano, Congo
Erta Ale volcano, Congo
West Mata underwater volcano
Kenyte lava
Basalt bomb
Quartz-feldspar porphyry
Banded gneiss
Santiago crater lava lake, Masaya caldera, Nicaragua
Erta Ale volcano lava lake, Ethiopia
Skjaldbreidur shield volcano, Iceland
Yasur volcano, Vanuatu
Aa lava, Pacaya, Guatemala
Obsidian-rich lava flow, Tenerife
Obsidian lava
Obsidian rock
Lava lake volcanic activity, Ethiopia
Lava lake volcanic fissures, Ethiopia
Volcanic rocks
Sample of basalt
Kambhorn reflected in lagoon, Iceland
Mount Etna erupting at night, 2012
Mount Etna erupting, 2012
Diorite intruded by microgranite
Hornblende-biotite granite
Volcanic eruption, Reunion Island
Mount Bromo erupting, Indonesia, 2011
Volcanic landscapes in Western Iceland.
Cracks on a lava lake
Volcanic eruption
New island formed by Hunga Tonga volcano, 2017
Eruption of Fuego volcano, November 2016
Sakurajima volcano erupting, Japan, 2012
Eruption of Mount Batu Tara, August 2011
Reventador volcano erupting, Ecuador
Smoke and light coming through crack in lava rock, elevated view
Aggregate of muscovite crystals
Banded rhyolite
Pegmatite specimen
Tuff specimen
Biotite
Biotite, Tyringham, Massachusetts, USA
Rhyolite, Mexico
Sample of biotite
Tuff rock with graded bedding
Cutaway model of the Earth's core
Rhyolite
Trachyte
Basalt columns
Eruption of Momotombo volcano, February 2016
La Tarta volcanic outcrop, Tenerife
Sample of granite
Lava flow
Basaltic lava flow, New Mexico, USA
Lava fountain, Erta Ale volcano, Ethiopia
Kilauea summit, Hawaii, USA
Obsidian mineral stone
Vanuatu, Ambrym Island, View of eruption at Marum lava lake
Fjallaback Nature Reserve, Iceland
Lava falls during Kilauea eruption, 1969
Volcanic lava delta
Volcan de Fuego erupting at night, Guatemala
Volcanic rock
Lava flow, deep sea vent
Aerial near Hekla Volcano
Erta Ale Volcano, Ethiopia
Kilauea eruption, May 2018
Geothermal hot spring vents, Ethiopia
Zoisite in pegmatite groundmass
Cold lava after an eruption of Tolbachik volcano, Kamchatka, Russia
Basalt pavement, Iceland
Sample of andesite
Andesite
Italian medieval city on volcanic neck
Blue Hauyne crystals in lava groundmass
Biotite in rock groundmass
Sanidine on trachyte lava groundmass
Snowflake Obisidian
Pink-white chabazite in basalt groundmass
Tourmaline Pegmatite
Muscovite crystals in rock groundmass
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
Basalt, Massachusetts, USA
Scoria, Oregon, USA
Green Tourmaline in Muscovite, Maine
Muscovite Star Mica
Amphibolite metamorphic rock
Sample of muscovite
Zeophyllite
Igneous rocks near Arbatax, Sardinia, Italy
Polished sphere of orbicular jasper
Quartz phyllite
Reddish pink apophyllite crystal and basalt groundmass
Heavily weathered kimberlite
Niobite in host rock
Niobite crystal
Pyroclastic rock
Tourmaline pegmatite
Staurolite crystal, light micrograph
Andesite rock, light micrograph
Vesicular basalt
Peridotite rock
Olivine inclusion in basalt
Basalt outcrop
Microfossils in volcanic rock