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

Basalt (River Cobble)

Basalt (Mafic volcanic rock)

Basalt (Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)) — igneous

Basalt

Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)

Basalt (Basalt) — igneous

Basalt

Basalt

Quartz Vein in Basalt or Mafic Rock (Silicon Dioxide (SiO2) vein in volcanic/mafic matrix) — igneous

Quartz Vein in Basalt or Mafic Rock

Silicon Dioxide (SiO2) vein in volcanic/mafic matrix

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

Vesicular Basalt (River Stone)

Basalt (Aphanitic-Vesicular Mafic Rock)

Basalt (Basalt) — igneous

Basalt

Basalt

Vein Quartz in Basalt or Mafic Rock (Silicon Dioxide (Quartz veins in volcanic host rock)) — igneous

Vein Quartz in Basalt or Mafic Rock

Silicon Dioxide (Quartz veins in volcanic host rock)

Basalt River Pebble (Extrusive mafic igneous rock) — igneous

Basalt River Pebble

Extrusive mafic igneous rock

Rhyolite Porphyry (Rhyolite (High-silica volcanic rock)) — igneous

Rhyolite Porphyry

Rhyolite (High-silica volcanic rock)

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

Scoria (Lava Rock)

Extrusive Igneous Scoria (Vesicular Basalt)

Basalt Pebble (Mafic Extrusive Igneous Rock) — igneous

Basalt Pebble

Mafic Extrusive Igneous Rock

Basalt (Basalt (dominated by plagioclase feldspar and pyroxene)) — igneous

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

Andesite (Andesite) — igneous

Andesite

Andesite

Andesite (Intermediate Volcanic Rock (Andesite)) — igneous

Andesite

Intermediate Volcanic Rock (Andesite)

Basalt with minor mineral crusting (Sideromelane / Extrusive Igneous Rock) — igneous

Basalt with minor mineral crusting

Sideromelane / Extrusive Igneous Rock

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Greenstone / altered basalt fragment (Likely chlorite–epidote–actinolite altered basalt; exact identification requires testing) — igneous

Greenstone / altered basalt fragment

Likely chlorite–epidote–actinolite altered basalt; exact identification requires testing

Basalt with Vesicular Amygdule (Extrusive igneous rock (Mafic)) — igneous

Basalt with Vesicular Amygdule

Extrusive igneous rock (Mafic)

Basalt (Mafic extrusive igneous rock) — igneous

Basalt

Mafic extrusive igneous rock

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

Basalt Pebble

Basalt (Mafic volcanic rock)

Agate (Chalcedony (SiO2)) — sedimentary

Agate

Chalcedony (SiO2)

Vesicular Basalt with Quartz/Chalcedony (Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)) — igneous

Vesicular Basalt with Quartz/Chalcedony

Vesicular Basalt (primarily Plagioclase, Pyroxene, and Olivine with SiO2 infill)

Porphyry (Porphyritic Igneous Rock) — igneous

Porphyry

Porphyritic Igneous Rock

Scoria (Scoriaceous Basalt) — igneous

Scoria

Scoriaceous Basalt

Basalt with Quartz/Plagioclase Inclusions (Mafic volcanic rock (Basaltic)) — igneous

Basalt with Quartz/Plagioclase Inclusions

Mafic volcanic rock (Basaltic)

Porphyritic Basalt (Porphyritic Basalt (containing Plagioclase phenocrysts)) — igneous

Porphyritic Basalt

Porphyritic Basalt (containing Plagioclase phenocrysts)

Porphyritic Basalt (Porphyry pebble) (Porphyritic Basalt / Amygdaloidal Basalt) — igneous

Porphyritic Basalt (Porphyry pebble)

Porphyritic Basalt / Amygdaloidal Basalt

Porphyry (Porphyritic Igneous Rock) — igneous

Porphyry

Porphyritic Igneous Rock

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

Vesicular Basalt (Scoria)

Basalt (Extrusive Igneous Rock)

Smoky Quartz and Chalcedony Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz and Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Tumbled basalt (likely) (Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, often with minor olivine and iron oxides) — igneous

Tumbled basalt (likely)

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, often with minor olivine and iron oxides

Basalt (Basalt (Volcanic Mafic Rock)) — igneous

Basalt

Basalt (Volcanic Mafic Rock)

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

Basalt

Basalt (Mafic Aphanitic Igneous Rock)

Ocellar Rhyolite (Rhyolite (featuring orbicular/ocellar quartz and feldspar textures)) — igneous

Ocellar Rhyolite

Rhyolite (featuring orbicular/ocellar quartz and feldspar textures)

Porphyritic Basalt (Basalt (with plagioclase phenocrysts)) — igneous

Porphyritic Basalt

Basalt (with plagioclase phenocrysts)

Porphyritic Basalt (Extrusive igneous rock with plagioclase phenocrysts) — igneous

Porphyritic Basalt

Extrusive igneous rock with plagioclase phenocrysts

Basalt Pebble (Aphanitic Mafic Igneous Rock) — igneous

Basalt Pebble

Aphanitic Mafic Igneous Rock

Vesicular Basalt River Rock (Vesicular Basalt) — igneous

Vesicular Basalt River Rock

Vesicular Basalt

Basalt cobble (Basalt; predominantly plagioclase, clinopyroxene, and often olivine or iron-titanium oxides) — igneous

Basalt cobble

Basalt; predominantly plagioclase, clinopyroxene, and often olivine or iron-titanium oxides

Clear Quartz (Faceted Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Faceted Crystal)

Silicon Dioxide (SiO2)

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

Basalt (River Stone)

Basalt (Mafic volcanic rock)