Rock Identifier

Category

Basalt

Browse basalt specimens identified by the Rock Identifier community.

Learn about Basalt in the encyclopedia

Basalt

Basalt

Tholeiitic Basalt

Tholeiitic Basalt

Metabasalt

Metabasalt

Variolite

Variolite

Tachylite

Tachylite

Gabbro

Gabbro

Sideromelane

Sideromelane

Palagonite

Palagonite

Diabase

Diabase

Greenstone

Greenstone

Limburgite

Limburgite

Scoria

Scoria

Basalt (Vesicular) (Basalt (Extrusive Mafic Igneous Rock)) — igneous

Basalt (Vesicular)

Basalt (Extrusive Mafic Igneous Rock)

Vesicular Basalt (Extrusive Mafic Volcanic Rock) — igneous

Vesicular Basalt

Extrusive Mafic Volcanic Rock

Peridotite (Peridotite (predominantly Olivine and Pyroxene)) — igneous

Peridotite

Peridotite (predominantly Olivine and Pyroxene)

Peridot (Olivine ((Mg, Fe)2SiO4)) — mineral

Peridot

Olivine ((Mg, Fe)2SiO4)

Quartz-filled Basalt Geode (Amygdaloidal Basalt with Quartz (SiO2)) — igneous

Quartz-filled Basalt Geode

Amygdaloidal Basalt with Quartz (SiO2)

Amygdaloidal Basalt with Agate/Quartz Infill (Basalt with Secondary Silicate Mineralization (SiO2)) — igneous

Amygdaloidal Basalt with Agate/Quartz Infill

Basalt with Secondary Silicate Mineralization (SiO2)

Basalt Pebble (Extrusive mafic igneous rock) — igneous

Basalt Pebble

Extrusive mafic igneous rock

Amygdaloidal Basalt (Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)

Basalt (Stream-worn Cobble) (Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Basalt (Stream-worn Cobble)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Peridot (Olivine ((Mg, Fe)2SiO4)) — mineral

Peridot

Olivine ((Mg, Fe)2SiO4)

Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic volcanic rock)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Andesite (Andesite) — igneous

Andesite

Andesite

Porphyritic Basalt (Porphyritic Basalt (Silicate Rock)) — igneous

Porphyritic Basalt

Porphyritic Basalt (Silicate Rock)

Olivine (Peridot when gem-quality) (Magnesium Iron Silicate (Mg,Fe)2SiO4) — mineral

Olivine (Peridot when gem-quality)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Amygdaloidal Basalt with Agate/Chalcedony Infills (Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)) — igneous

Amygdaloidal Basalt with Agate/Chalcedony Infills

Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)

Basalt Pebble with Epidote/Olivine (Vitreous Basalt (SiO2 with Ca/Mg/Fe silicates)) — igneous

Basalt Pebble with Epidote/Olivine

Vitreous Basalt (SiO2 with Ca/Mg/Fe silicates)

Vesicular Basalt (River Stone) (Basalt (Aphanitic-Vesicular Mafic Rock)) — igneous

Vesicular Basalt (River Stone)

Basalt (Aphanitic-Vesicular Mafic Rock)

Opal (Hydrated amorphous silica (SiO2·nH2O)) — mineral

Opal

Hydrated amorphous silica (SiO2·nH2O)

Prehnite (Prehnite (Ca2Al2Si3O10(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Andesite (Intermediate Volcanic Rock (Andesite)) — igneous

Andesite

Intermediate Volcanic Rock (Andesite)

Riverstone (Gray Basalt) (Basalt (Maier-type or generic)) — igneous

Riverstone (Gray Basalt)

Basalt (Maier-type or generic)

Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic Extrusive volcanic rock)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Basalt (Road Gravel) (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt (Road Gravel)

Basalt (Mafic Extrusive Igneous Rock)

Basalt with Alteration Crust (Basalt (SiO2 range 45-52%)) — igneous

Basalt with Alteration Crust

Basalt (SiO2 range 45-52%)

Andesite (Andesite (Intermediate Volcanic Rock)) — igneous

Andesite

Andesite (Intermediate Volcanic Rock)

Basalt with Quartz Infill (Basalt (Mafic Extrusive Volcanic Rock)) — igneous

Basalt with Quartz Infill

Basalt (Mafic Extrusive Volcanic Rock)

Basalt with Weathered Crust (Aphanitic Mafic Igneous Rock (Basalt)) — igneous

Basalt with Weathered Crust

Aphanitic Mafic Igneous Rock (Basalt)

Basalt River Stone (Extrusive mafic igneous rock (Basalt)) — igneous

Basalt River Stone

Extrusive mafic igneous rock (Basalt)

Basalt River Pebble (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt River Pebble

Basalt (Aphanitic Mafic Igneous Rock)

Basalt with Quartz/Calcite Veins (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt with Quartz/Calcite Veins

Basalt (Aphanitic Mafic Igneous Rock)

Basalt River Stone (Basalt (Aphanitic Mafic Volcanic Rock)) — igneous

Basalt River Stone

Basalt (Aphanitic Mafic Volcanic Rock)

Granodiorite (Phaneritic Granodiorite) — igneous

Granodiorite

Phaneritic Granodiorite

Basalt (Crushed Stone Aggregate) (Mafic Volcanic Basalt (Major Minerals: Plagioclase Feldspar, Pyroxene, Olivine)) — igneous

Basalt (Crushed Stone Aggregate)

Mafic Volcanic Basalt (Major Minerals: Plagioclase Feldspar, Pyroxene, Olivine)

Basalt with Weathering Crust (Extrusive mafic volcanic rock) — igneous

Basalt with Weathering Crust

Extrusive mafic volcanic rock

Basalt Pebble (Extrusive mafic igneous rock) — igneous

Basalt Pebble

Extrusive mafic igneous rock

Basalt River Stone (Basalt (Mafic volcanic rock)) — igneous

Basalt River Stone

Basalt (Mafic volcanic rock)

Basalt Water-Worn Pebble (Aphanitic Mafic Igneous Rock) — igneous

Basalt Water-Worn Pebble

Aphanitic Mafic Igneous Rock

Basalt with Vesicles (Aphanitic Mafic Volcanic Rock (Basalt)) — igneous

Basalt with Vesicles

Aphanitic Mafic Volcanic Rock (Basalt)

Basalt with Iron Oxides (Mafic Igneous Rock (Mafite)) — igneous

Basalt with Iron Oxides

Mafic Igneous Rock (Mafite)

Basalt Pebble with Quartz Veining (Basalt (extrusive volcanic rock)) — igneous

Basalt Pebble with Quartz Veining

Basalt (extrusive volcanic rock)

Basalt with Quartz Veining (Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)) — igneous

Basalt with Quartz Veining

Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)

Basalt with Iron Oxidation (Amygdaloidal Basalt (silicate rock primarily plagioclase, pyroxene, and olivine)) — igneous

Basalt with Iron Oxidation

Amygdaloidal Basalt (silicate rock primarily plagioclase, pyroxene, and olivine)