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 (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Porphyry (specifically Porphyritic Andesite / Rhyolite) (Porphyritic Igneous Rock) — igneous

Porphyry (specifically Porphyritic Andesite / Rhyolite)

Porphyritic Igneous Rock

Porphyry (Porphyritic Igneous Rock) — igneous

Porphyry

Porphyritic Igneous Rock

Obsidian (likely Golden Sheen Obsidian or Rainbow Obsidian, given the subtle sheen visible on some beads) (Obsidian (volcanic glass, predominantly SiO2 with various impurities)) — Igneous

Obsidian (likely Golden Sheen Obsidian or Rainbow Obsidian, given the subtle sheen visible on some beads)

Obsidian (volcanic glass, predominantly SiO2 with various impurities)

Lava Rock (Basalt / Scoria) — igneous

Lava Rock

Basalt / Scoria

Vesicular basalt (likely scoria) (Mafic volcanic rock; predominantly plagioclase, pyroxene, and volcanic glass, with possible olivine) — igneous

Vesicular basalt (likely scoria)

Mafic volcanic rock; predominantly plagioclase, pyroxene, and volcanic glass, with possible olivine

Porphyritic Basalt (Chinese Writing Stone) (Porphyritic Basalt or Porphyritic Andesite) — igneous

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basalt or Porphyritic Andesite

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Agate (SiO2) — Mineral

Agate

SiO2

Pumice (Pumice (Highly vesicular volcanic rock)) — igneous

Pumice

Pumice (Highly vesicular volcanic rock)

Porphyry (Porphyritic Igneous Rock) — igneous

Porphyry

Porphyritic Igneous Rock

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

Vesicular Basalt (Lava Rock)

Vesicular Basalt

Amygdaloidal Basalt (Basalt with secondary mineral infilling (SiO2/CO3)) — igneous

Amygdaloidal Basalt

Basalt with secondary mineral infilling (SiO2/CO3)

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

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Vesicular Basalt (Scoria) (Basalt with vesicular texture) — igneous

Vesicular Basalt (Scoria)

Basalt with vesicular texture

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

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

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

Basalt Pebble

Extrusive igneous rock (Mafic)

Basalt (Mafic extrusive igneous rock) — igneous

Basalt

Mafic extrusive igneous rock

Quartz in Basalt (Xenocryst) (Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock) — Igneous

Quartz in Basalt (Xenocryst)

Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock

Basalt with Quartz/Calcite Veins (Basalt with hydrothermal vein infill) — igneous

Basalt with Quartz/Calcite Veins

Basalt with hydrothermal vein infill

Obsidian (Volcanic Glass (SiO2)) — igneous

Obsidian

Volcanic Glass (SiO2)

Veined basalt (likely basalt with quartz/calcite vein) (Basalt, aphanitic mafic volcanic rock; vein minerals likely quartz (SiO₂) or calcite (CaCO₃)) — igneous

Veined basalt (likely basalt with quartz/calcite vein)

Basalt, aphanitic mafic volcanic rock; vein minerals likely quartz (SiO₂) or calcite (CaCO₃)

Milky Quartz with Mineral Inclusions (Silicon Dioxide (SiO2) with miscellaneous inclusions) — mineral

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2) with miscellaneous inclusions

Basalt with Porphyritic Texture (Porphyritic Basalt) — igneous

Basalt with Porphyritic Texture

Porphyritic Basalt

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Basalt (Mafic Extrusive Igneous Rock) — igneous

Basalt

Mafic Extrusive Igneous Rock

Greenstone / Basalt with Amygdule (Amygdaloidal Basalt (altered to Greenstone)) — igneous

Greenstone / Basalt with Amygdule

Amygdaloidal Basalt (altered to Greenstone)

Snowflake Obsidian (Polished Cabochon) (Obsidian with Spherulitic Cristobalite (SiO2)) — igneous

Snowflake Obsidian (Polished Cabochon)

Obsidian with Spherulitic Cristobalite (SiO2)

Bloodstone Jasper (Heliotrope) (SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz) — sedimentary

Bloodstone Jasper (Heliotrope)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

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

Quartz (Druzy)

Silicon Dioxide (SiO2)

Basalt (River-worn Specimen) (Extrusive Mafic Igneous Rock) — igneous

Basalt (River-worn Specimen)

Extrusive Mafic Igneous Rock

Obsidian (black volcanic glass) (Obsidian; primarily amorphous SiO₂-rich rhyolitic glass) — igneous

Obsidian (black volcanic glass)

Obsidian; primarily amorphous SiO₂-rich rhyolitic glass

Peridotite Xenolith (Olivine) (Peridotite (predominantly Forsterite, (Mg,Fe)2SiO4)) — igneous

Peridotite Xenolith (Olivine)

Peridotite (predominantly Forsterite, (Mg,Fe)2SiO4)

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt River Cobble (Basalt) — igneous

Basalt River Cobble

Basalt

Vesicular Basalt with Mineral Inclusions (Vesicular Basalt) — igneous

Vesicular Basalt with Mineral Inclusions

Vesicular Basalt

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

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Likely basalt (Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine) — igneous

Likely basalt

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine

Dalmatian Jasper (Peralkaline rhyolite with arfvedsonite inclusions) — igneous

Dalmatian Jasper

Peralkaline rhyolite with arfvedsonite inclusions

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

Porphyritic Basalt

Porphyritic Basalt (with Plagioclase phenocrysts)