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)

Dark weathered igneous rock, likely basalt (Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides) — igneous

Dark weathered igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

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

Agate

Silicon dioxide (Chalcedony), SiO2

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

Basalt (Vesicular)

Basalt (Extrusive Igneous)

Vesicular Basalt (or Scoria) (Mafic extrusive igneous rock with vesicles) — igneous

Vesicular Basalt (or Scoria)

Mafic extrusive igneous rock with vesicles

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

Basalt (River Pebble)

Extrusive mafic igneous rock

Vesicular Basalt (Vesicular Basalt (Mafic Volcanic Rock)) — igneous

Vesicular Basalt

Vesicular Basalt (Mafic Volcanic Rock)

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

Basalt Pebble

Basalt (Mafic Volcanic Rock)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Vesicular quartz-rich rock, possibly weathered rhyolite or hydrothermal quartz (Likely quartz (SiO₂) with altered feldspar, iron oxides, and cavities; exact identification requires testing) — igneous

Vesicular quartz-rich rock, possibly weathered rhyolite or hydrothermal quartz

Likely quartz (SiO₂) with altered feldspar, iron oxides, and cavities; exact identification requires testing

Basalt (Basalt (Extrusive Igneous Rock)) — igneous

Basalt

Basalt (Extrusive Igneous Rock)

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

Basalt (River Stone)

Extrusive mafic igneous rock

Black river pebble, likely basalt (Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine) — igneous

Black river pebble, likely basalt

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine

Dark mafic igneous rock, likely basalt or gabbro (Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine) — igneous

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine

Andesite (Andesite (Intermediate Volcanic Rock)) — igneous

Andesite

Andesite (Intermediate Volcanic Rock)

Rough Amethyst (Silicon Dioxide (SiO2) with Iron impurities) — mineral

Rough Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Spinifex Texture Komatiite (Komatiite (Ultramafic Volcanic Rock)) — igneous

Spinifex Texture Komatiite

Komatiite (Ultramafic Volcanic Rock)

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

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

Basalt River Cobble

Basalt (Mafic Igneous Rock)

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

Basalt River Pebble

Basalt (Mafic volcanic rock)

Black Obsidian (Volcanic Glass (predominantly SiO2, Silicon Dioxide)) — igneous

Black Obsidian

Volcanic Glass (predominantly SiO2, Silicon Dioxide)

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Red Scoria (Scoria (Vesicular Basalt/Andesite)) — igneous

Red Scoria

Scoria (Vesicular Basalt/Andesite)

Dalmation Jasper (Aplite with Arfvedsonite inclusions (SiO2 with Na3(Mg,Fe2+)4AlSi8O22(OH)2)) — igneous

Dalmation Jasper

Aplite with Arfvedsonite inclusions (SiO2 with Na3(Mg,Fe2+)4AlSi8O22(OH)2)

Quartz on Host Rock (Silicon Dioxide (SiO2)) — Mineral Specimen

Quartz on Host Rock

Silicon Dioxide (SiO2)

Mineral Specimen

Obsidian (Volcanic Glass (Amorphous silicon dioxide with trace impurities)) — igneous

Obsidian

Volcanic Glass (Amorphous silicon dioxide with trace impurities)

Banded Igneous Dike Rock (Intrusive igneous rock with felsic/mafic banding) — igneous

Banded Igneous Dike Rock

Intrusive igneous rock with felsic/mafic banding

Basalt with Weathering Rind (Basalt (Mafic Volcanic Rock)) — igneous

Basalt with Weathering Rind

Basalt (Mafic Volcanic Rock)

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

Basalt River Stone

Basalt (Mafic volcanic rock)

Clear Quartz (Cut/Faceted Gemstone) (Silicon Dioxide (SiO2)) — gemstone

Clear Quartz (Cut/Faceted Gemstone)

Silicon Dioxide (SiO2)

Basalt with Quartz Vein (Mafic Igneous Rock (Basalt) with SiO2 (Quartz) Vein) — igneous

Basalt with Quartz Vein

Mafic Igneous Rock (Basalt) with SiO2 (Quartz) Vein

Druzy Quartz (part of a Geode) (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz (part of a Geode)

Silicon Dioxide (SiO2)

Basalt (Basalt (Igneous Volcanic)) — igneous

Basalt

Basalt (Igneous Volcanic)

Basalt with Xenolith (Extrusive Igneous Rock containing Mantle Xenolith) — igneous

Basalt with Xenolith

Extrusive Igneous Rock containing Mantle Xenolith

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

Basalt (River Stone)

Extrusive mafic igneous rock

Porphyritic Basalt (Basalt with plagioclase phenocrysts) — igneous

Porphyritic Basalt

Basalt with plagioclase phenocrysts

Vesicular Basalt or Porphyritic Rhyolite (Extrusive Igneous Rock) — igneous

Vesicular Basalt or Porphyritic Rhyolite

Extrusive Igneous Rock

Amethyst (Amethyst (Silicon Dioxide, SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Basalt River Stone (Aphanitic Mafic Igneous Rock) — igneous

Basalt River Stone

Aphanitic Mafic Igneous Rock

Tumbled Agate (Silicon dioxide (SiO2)) — sedimentary

Tumbled Agate

Silicon dioxide (SiO2)

Amygdaloidal Basalt with Epidote (Vesicular Basalt with secondary Epidote/Quartz mineral infill) — igneous

Amygdaloidal Basalt with Epidote

Vesicular Basalt with secondary Epidote/Quartz mineral infill