Rock Identifier

Category

Igneous Rock (Volcanic Glass)

Browse igneous rock (volcanic glass) specimens identified by the Rock Identifier community.

Learn about Igneous Rock (Volcanic Glass) in the encyclopedia

Rock Gypsum

Coral Rock

Asphalt Rock

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Black Obsidian

Obsidian

Pink Obsidian

Sideromelane

Carbonatite

Tachylite

Basalt (Beach Pebble) (Extrusive mafic volcanic rock) — igneous

Basalt (Beach Pebble)

Extrusive mafic volcanic rock

Basalt (Vesicular or Scoriaceous) (Aphanitic Mafic Volcanic Rock) — igneous

Basalt (Vesicular or Scoriaceous)

Aphanitic Mafic Volcanic Rock

Basalt River Pebble (Aphanitic mafic volcanic rock) — igneous

Basalt River Pebble

Aphanitic mafic volcanic rock

Basalt (Vesicular/Amygdaloidal) (Basalt) — igneous

Basalt (Vesicular/Amygdaloidal)

Basalt

Basalt (Mafic volcanic rock (Basalt)) — igneous

Basalt

Mafic volcanic rock (Basalt)

Basalt (Mafic extrusive igneous rock) — igneous

Basalt

Mafic extrusive igneous rock

Quartz Druzy (Geode Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)

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

Basalt River Pebble

Aphanitic Mafic Volcanic Rock (Basalt)

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

Basalt River Stone

Basalt (Aphanitic Mafic Volcanic Rock)

Porphyritic Basalt (with Augite Crystals) (Porphyritic Mafic Volcanic Rock (Fe-Mg Silicates)) — igneous

Porphyritic Basalt (with Augite Crystals)

Porphyritic Mafic Volcanic Rock (Fe-Mg Silicates)

Amygdaloidal Basalt (Extrusive mafic igneous rock with amygdules) — igneous

Amygdaloidal Basalt

Extrusive mafic igneous rock with amygdules

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

Basalt (Vesicular)

Basalt (Mafic Extrusive Igneous Rock)

Basalt (Water-worn Pebble) (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt (Water-worn Pebble)

Basalt (Mafic Extrusive Igneous Rock)

Vesicular Basalt (Lava Rock) (Basalt with vesicular texture) — igneous

Vesicular Basalt (Lava Rock)

Basalt with vesicular texture

Agate (Silicon Dioxide (Chalcedony), SiO2) — sedimentary

Agate

Silicon Dioxide (Chalcedony), SiO2

Olivine in Basalt (Peridot) (Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)) — igneous

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)

Basalt with Hematite staining (Extrusive mafic igneous rock with Fe2O3) — igneous

Basalt with Hematite staining

Extrusive mafic igneous rock with Fe2O3

Black Beach Pebble / Basalt Pebble (Basalt / Mafic Volcanic Rock) — igneous

Black Beach Pebble / Basalt Pebble

Basalt / Mafic Volcanic Rock

Basalt River Pebble (Extrusive mafic volcanic rock) — igneous

Basalt River Pebble

Extrusive mafic volcanic rock

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

Basalt Pebble

Basalt (Mafic volcanic rock)

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

Basalt Water-Worn Pebble

Aphanitic Mafic Igneous Rock

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

Basalt Pebble

Mafic Igneous Rock (Basalt)

Vesicular quartz-rich rock, possibly weathered rhyolite or silicified volcanic breccia (Silica-rich volcanic rock; likely microcrystalline quartz (SiO₂) with altered feldspar and iron-oxide staining) — igneous

Vesicular quartz-rich rock, possibly weathered rhyolite or silicified volcanic breccia

Silica-rich volcanic rock; likely microcrystalline quartz (SiO₂) with altered feldspar and iron-oxide staining

Vesicular Basalt (Scoria) (Vesicular Basalt) — igneous

Vesicular Basalt (Scoria)

Vesicular Basalt

Basalt (Extrusive Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)) — igneous

Basalt

Extrusive Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)

Dark volcanic rock, likely basalt (Basalt; fine-grained mafic silicate rock dominated by plagioclase and pyroxene, commonly with olivine) — igneous

Dark volcanic rock, likely basalt

Basalt; fine-grained mafic silicate rock dominated by plagioclase and pyroxene, commonly with olivine

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

Vesicular Basalt (Amygdaloidal Basalt)

Extrusive Mafic Igneous Rock

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Rhyolite (Extrusive igneous rock (felsic)) — igneous

Rhyolite

Extrusive igneous rock (felsic)

Diorite (Intermediate Phaneritic Igneous Rock) — igneous

Diorite

Intermediate Phaneritic Igneous Rock

Amygdaloidal Basalt (Vesicular Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)) — igneous

Amygdaloidal Basalt

Vesicular Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)

Dalmation Stone (Dalmation Jasper) (Peralkaline Rock with Feldspar and Arfvedsonite) — igneous

Dalmation Stone (Dalmation Jasper)

Peralkaline Rock with Feldspar and Arfvedsonite

Diorite (Diorite) — igneous

Diorite

Diorite

Basalt (Basalt (Mafic Extrusive)) — igneous

Basalt

Basalt (Mafic Extrusive)

Vesicular basalt (scoria-like volcanic rock) (Vesicular basalt; commonly composed of plagioclase, pyroxene, olivine, and volcanic glass) — igneous

Vesicular basalt (scoria-like volcanic rock)

Vesicular basalt; commonly composed of plagioclase, pyroxene, olivine, and volcanic glass

Agate (Silicon Dioxide (Chalcedony), SiO2) — sedimentary

Agate

Silicon Dioxide (Chalcedony), SiO2

Snowflake Obsidian (Spherulitic Volcanic Glass (primarily SiO2)) — igneous

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2)

Weathered Basalt with Iron Staining (Mafic Igneous Rock) — igneous

Weathered Basalt with Iron Staining

Mafic Igneous Rock

Lava Rock (Scoria) (Scoria (Vesicular Basalt)) — igneous

Lava Rock (Scoria)

Scoria (Vesicular Basalt)

Black Obsidian (Obsidian, volcanic glass (Amorphous SiO₂)) — Igneous Rock

Black Obsidian

Obsidian, volcanic glass (Amorphous SiO₂)

Basalt (Basalt (dominated by Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Basalt (dominated by Plagioclase Feldspar and Pyroxene)

Basalt Pebble (Mafic Extrusive Igneous Rock) — igneous

Basalt Pebble

Mafic Extrusive Igneous Rock