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 (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Basalt (Basalt (composition predominately Plagioclase feldspar and Pyroxene)) — igneous

Basalt

Basalt (composition predominately Plagioclase feldspar and Pyroxene)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

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

Basalt River Pebble

Mafic Volcanic Rock (Basalt)

Vesicular Basalt (Extrusive mafic igneous rock) — igneous

Vesicular Basalt

Extrusive mafic igneous rock

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Obsidian (Obsidian (Volcanic Glass; SiO2 content > 70%)) — igneous

Obsidian

Obsidian (Volcanic Glass; SiO2 content > 70%)

Amygdaloidal Basalt (Basalt with secondary amygdule minerals (likely Epidote or Chlorite)) — igneous

Amygdaloidal Basalt

Basalt with secondary amygdule minerals (likely Epidote or Chlorite)

Basalt (Basalt) — igneous

Basalt

Basalt

Rhyolite (Rhyolite (felsic volcanic rock)) — igneous

Rhyolite

Rhyolite (felsic volcanic rock)

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

Basalt River Stone

Basalt (Mafic volcanic rock)

Basalt Cobble (Aphanitic Mafic Volcanic Rock (Basalt)) — igneous

Basalt Cobble

Aphanitic Mafic Volcanic Rock (Basalt)

Basalt River Pebble (Aphanitic Mafic Igneous Rock) — igneous

Basalt River Pebble

Aphanitic Mafic Igneous Rock

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

Basalt (River Pebble)

Extrusive Mafic Igneous Rock

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

Basalt River Pebble

Basalt (Aphanitic Mafic Igneous Rock)

Diorite (Diorite (Intermediate intrusive igneous rock)) — igneous

Diorite

Diorite (Intermediate intrusive igneous rock)

Vesicular Basalt / Scoria pebble (Extrusive igneous rock with amygdaloidal infilling) — igneous

Vesicular Basalt / Scoria pebble

Extrusive igneous rock with amygdaloidal infilling

Rough Agate/Chert Nodules (Cryptocrystalline Quartz (SiO2)) — sedimentary

Rough Agate/Chert Nodules

Cryptocrystalline Quartz (SiO2)

Porphyritic Basalt (Drill Core) (Porphyritic Basalt with Plagioclase Phenocrysts) — igneous

Porphyritic Basalt (Drill Core)

Porphyritic Basalt with Plagioclase Phenocrysts

Blue Obsidian (Cullet Glass) (Silicon Dioxide (Amorphous Glass)) — mineral

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

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

Basalt River Stone

Basalt (Aphanitic Mafic Igneous Rock)

Basalt Riverstone (Basalt (Aphanitic Mafic Volcanic Rock)) — igneous

Basalt Riverstone

Basalt (Aphanitic Mafic Volcanic Rock)

Basalt Fragment (Extrusive Igneous Rock) — igneous

Basalt Fragment

Extrusive Igneous Rock

Basalt (River Cobble) (Mafic Igneous Rock (Basalt)) — igneous

Basalt (River Cobble)

Mafic Igneous Rock (Basalt)

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

Basalt Pebble

Basalt (Extrusive Igneous Rock)

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

Basalt (River Pebble)

Extrusive mafic igneous rock

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

Basalt (River Pebble)

Extrusive Mafic Igneous Rock

Amygdaloidal Basalt (Basalt (Igneous Volcanic Rock with secondary mineral infilling)) — igneous

Amygdaloidal Basalt

Basalt (Igneous Volcanic Rock with secondary mineral infilling)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Vesicular Basalt (Scoria) (Vesicular Basalt) — igneous

Vesicular Basalt (Scoria)

Vesicular Basalt

Possible iron-rich basalt or industrial slag (Basalt, likely Fe–Mg silicate rock; exact identification is uncertain from the blurred image) — igneous

Possible iron-rich basalt or industrial slag

Basalt, likely Fe–Mg silicate rock; exact identification is uncertain from the blurred image

Basalt (Extrusive igneous rock) — igneous

Basalt

Extrusive igneous rock

Basalt Breccia (Volcanic Breccia (composed of basaltic clasts in a fine-grained matrix)) — igneous

Basalt Breccia

Volcanic Breccia (composed of basaltic clasts in a fine-grained matrix)

Basalt (Aphanitic Mafic Igneous Rock) — igneous

Basalt

Aphanitic Mafic Igneous Rock

Agate (or Chalcedony with Moss/Jasper Inclusions) (Silicon Dioxide (SiO2)) — mineral

Agate (or Chalcedony with Moss/Jasper Inclusions)

Silicon Dioxide (SiO2)

Likely weathered brown quartz-bearing rock (Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph) — igneous

Likely weathered brown quartz-bearing rock

Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph

Mixed river-worn rock and mineral collection (Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble) — igneous, sedimentary, metamorphic, mineral

Mixed river-worn rock and mineral collection

Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble

igneous, sedimentary, metamorphic, mineral

Slag (Anthropogenic Vitreous Silicate / Ferro-silicate Slag) — igneous

Slag

Anthropogenic Vitreous Silicate / Ferro-silicate Slag

River Cobble (likely Basalt or Mafic Igneous Rock) (Extrusive Mafic Igneous Rock (e.g., Basalt)) — igneous

River Cobble (likely Basalt or Mafic Igneous Rock)

Extrusive Mafic Igneous Rock (e.g., Basalt)

Obsidian (Obsidian (principally SiO2)) — igneous

Obsidian

Obsidian (principally SiO2)

Obsidian (Volcanic Glass (SiO2 - Silicon Dioxide with impurities)) — Igneous

Obsidian

Volcanic Glass (SiO2 - Silicon Dioxide with impurities)