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

Rock Salt

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Black Obsidian

Obsidian

Pink Obsidian

Sideromelane

Carbonatite

Tachylite

Pumice (Pumice (felsic volcanic rock)) — igneous

Pumice

Pumice (felsic volcanic rock)

Basalt (Extrusive igneous rock primarily composed of plagioclase feldspar and pyroxene) — igneous

Basalt

Extrusive igneous rock primarily composed of plagioclase feldspar and pyroxene

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Pumice (Pumice (volcanic glass foam)) — igneous

Pumice

Pumice (volcanic glass foam)

Polished obsidian (Volcanic glass; predominantly rhyolitic SiO₂) — igneous

Polished obsidian

Volcanic glass; predominantly rhyolitic SiO₂

Tumbled mahogany obsidian (Volcanic glass, predominantly rhyolitic silica (SiO₂), with iron-oxide inclusions) — igneous

Tumbled mahogany obsidian

Volcanic glass, predominantly rhyolitic silica (SiO₂), with iron-oxide inclusions

Pumice (Felsic volcanic rock) — igneous

Pumice

Felsic volcanic rock

Pumice (Volcanic glass / Pumice) — igneous

Pumice

Volcanic glass / Pumice

Small black stone fragment (possibly obsidian) (Unidentified dark rock; obsidian is volcanic glass (composition typically rhyolitic)) — igneous

Small black stone fragment (possibly obsidian)

Unidentified dark rock; obsidian is volcanic glass (composition typically rhyolitic)

Pumice (Pumice (Vesicular Rhyolite/Andesite)) — igneous

Pumice

Pumice (Vesicular Rhyolite/Andesite)

Pumice (Pumice (Amorphous volcanic glass)) — igneous

Pumice

Pumice (Amorphous volcanic glass)

Vesicular volcanic rock, likely pumice (Pumice (highly vesicular rhyolitic–dacitic volcanic glass; composition commonly rich in quartz and feldspar)) — igneous

Vesicular volcanic rock, likely pumice

Pumice (highly vesicular rhyolitic–dacitic volcanic glass; composition commonly rich in quartz and feldspar)

Pumice (Volcanic Rock) (Vesicular volcanic rock (composed largely of amorphous volcanic glass)) — igneous

Pumice (Volcanic Rock)

Vesicular volcanic rock (composed largely of amorphous volcanic glass)

Pumice (Pumice (felsic volcanic rock)) — igneous

Pumice

Pumice (felsic volcanic rock)

Porous quartz-rich rock, likely weathered rhyolite or silicified volcanic breccia (Rhyolite or volcanic breccia; predominantly microcrystalline quartz (SiO₂) with altered feldspar and iron oxides) — igneous

Porous quartz-rich rock, likely weathered rhyolite or silicified volcanic breccia

Rhyolite or volcanic breccia; predominantly microcrystalline quartz (SiO₂) with altered feldspar and iron oxides

Black Obsidian (Volcanic Glass (SiO2 + impurities)) — igneous

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Obsidian (Volcanic Glass (70-75% SiO2)) — igneous

Obsidian

Volcanic Glass (70-75% SiO2)

Pumice (Pumice (a highly vesicular volcanic rock)) — igneous

Pumice

Pumice (a highly vesicular volcanic rock)

Apache Tear (Hydrated Obsidian (Volcanic Glass)) — igneous

Apache Tear

Hydrated Obsidian (Volcanic Glass)

Spherulitic Rhyolite / Leopard Skin Rhyolite (Extrusive felsic igneous rock with spherulites) — igneous

Spherulitic Rhyolite / Leopard Skin Rhyolite

Extrusive felsic igneous rock with spherulites

Obsidian (Volcanic Glass (Amorphous SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous SiO2)

Vesicular volcanic rock (likely pumice) (Pumice, a highly vesicular volcanic glass; exact identification is uncertain from the image) — igneous

Vesicular volcanic rock (likely pumice)

Pumice, a highly vesicular volcanic glass; exact identification is uncertain from the image

Pumice (Pumice (felsic volcanic rock)) — igneous

Pumice

Pumice (felsic volcanic rock)

Rhyolite (Rhyolite (felsic volcanic rock)) — igneous

Rhyolite

Rhyolite (felsic volcanic rock)

Obsidian (Volcanic Glass (Amorphous Silicon Dioxide)) — igneous

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Mahogany Obsidian (Volcanic Glass (SiO2 with iron and magnesium oxides)) — igneous

Mahogany Obsidian

Volcanic Glass (SiO2 with iron and magnesium oxides)

Pumice (Vesicular Rhyolite/Andesite) (Pumice (a highly vesicular volcanic glass/extrusive igneous rock)) — igneous

Pumice (Vesicular Rhyolite/Andesite)

Pumice (a highly vesicular volcanic glass/extrusive igneous rock)

Scoria (Lava Rock) (Scoria (Vesicular Basaltic Glass/Rock)) — igneous

Scoria (Lava Rock)

Scoria (Vesicular Basaltic Glass/Rock)

Pumice (Pumice (highly vesicular volcanic glass; typically rhyolitic to dacitic composition)) — igneous

Pumice

Pumice (highly vesicular volcanic glass; typically rhyolitic to dacitic composition)

Obsidian (Volcanic Glass (SiO2 + impurities)) — igneous

Obsidian

Volcanic Glass (SiO2 + impurities)

Pumice (Pumice (a frothy volcanic glass)) — igneous

Pumice

Pumice (a frothy volcanic glass)

Pumice (Pumice (Amorphous volcanic glass)) — igneous

Pumice

Pumice (Amorphous volcanic glass)

Pumice (Pumice (extrusive volcanic rock)) — igneous

Pumice

Pumice (extrusive volcanic rock)

Pumice (Pumice (a vesicular volcanic glass)) — igneous

Pumice

Pumice (a vesicular volcanic glass)

Rounded basalt pebble (Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with minor olivine or iron oxides) — igneous

Rounded basalt pebble

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with minor olivine or iron oxides

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

Rhyolite

Rhyolite (High-silica volcanic rock)

Pumice (Pumice (Vesicular Rhyolite/Dacite)) — igneous

Pumice

Pumice (Vesicular Rhyolite/Dacite)

Polished black obsidian (Volcanic glass; predominantly rhyolitic silica glass (approximately SiO₂-rich)) — igneous

Polished black obsidian

Volcanic glass; predominantly rhyolitic silica glass (approximately SiO₂-rich)

Black Obsidian (Obsidian (Volcanic Glass, SiO2 + impurities)) — igneous

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Pumice (Pumice (Volcanic glass / Felsic extrusive rock)) — igneous

Pumice

Pumice (Volcanic glass / Felsic extrusive rock)

Pumice (Pumice (a highly vesicular, silicic volcanic rock)) — igneous

Pumice

Pumice (a highly vesicular, silicic volcanic rock)