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)

Quartz Vein in Basalt (Silica-infilled basaltic host rock) — igneous

Quartz Vein in Basalt

Silica-infilled basaltic host rock

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Basalt with Quartz/Calcite Veins (Aphanitic Mafic Igneous Rock (Hydrothermal Veined)) — igneous

Basalt with Quartz/Calcite Veins

Aphanitic Mafic Igneous Rock (Hydrothermal Veined)

Bumble Bee Jasper (Volcanic Tuff (mixture of SiO2, CaCo3, S, and As2S3)) — igneous

Bumble Bee Jasper

Volcanic Tuff (mixture of SiO2, CaCo3, S, and As2S3)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Dark-colored Igneous Rock (likely Basalt or Diabase) (Basalt (extrusive igneous) or Diabase (intrusive igneous)) — Igneous Rock

Dark-colored Igneous Rock (likely Basalt or Diabase)

Basalt (extrusive igneous) or Diabase (intrusive igneous)

Basalt River Cobble (Vitreous aphanitic Basalt) — igneous

Basalt River Cobble

Vitreous aphanitic Basalt

Porphyritic Basalt with K-Feldspar Phenocryst (Porphyritic Basic Igneous Rock (with Potassium Feldspar)) — igneous

Porphyritic Basalt with K-Feldspar Phenocryst

Porphyritic Basic Igneous Rock (with Potassium Feldspar)

Scoria (vesicular basalt) (Scoria; vesicular mafic volcanic rock, commonly basaltic in composition) — igneous

Scoria (vesicular basalt)

Scoria; vesicular mafic volcanic rock, commonly basaltic in composition

Amygdaloidal Basalt (Amygdaloidal Basalt (extrusive volcanic rock)) — Igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock)

Rounded gray pebble, likely basalt or andesite (Fine-grained volcanic rock, probably basaltic-andesite; exact identification requires testing) — igneous

Rounded gray pebble, likely basalt or andesite

Fine-grained volcanic rock, probably basaltic-andesite; exact identification requires testing

Pumice (Pumice) — igneous

Pumice

Pumice

Basalt (Basalt (dominated by Plagioclase and Pyroxene)) — igneous

Basalt

Basalt (dominated by Plagioclase and Pyroxene)

Basalt (Basaltic Mafic Rock) — igneous

Basalt

Basaltic Mafic Rock

Basalt with Vesicle/Vug (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt with Vesicle/Vug

Basalt (Aphanitic Mafic Igneous Rock)

Basalt (with possible weathering) (Basalt) — igneous

Basalt (with possible weathering)

Basalt

Basalt (Vesicular) (Extrusive mafic igneous rock) — igneous

Basalt (Vesicular)

Extrusive mafic igneous rock

Dalmation Stone (Peralkaline Rock (mixed silicate minerals)) — igneous

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

Basalt with Calcite Veins (Extrusive Igneous Rock) — igneous

Basalt with Calcite Veins

Extrusive Igneous Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Vesicular Basalt (Mafic Igneous Rock) — igneous

Vesicular Basalt

Mafic Igneous Rock

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

Agate

Silicon Dioxide (Chalcedony), SiO2

Basalt (River Rock pebble) (Basalt (a mafic extrusive igneous rock)) — igneous

Basalt (River Rock pebble)

Basalt (a mafic extrusive igneous rock)

Vesicular Basalt (Extrusive mafic igneous rock) — igneous

Vesicular Basalt

Extrusive mafic igneous rock

Olivine in Basalt (Peridotite Xenolith) (Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt) — igneous

Olivine in Basalt (Peridotite Xenolith)

Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt

Blue Chalcedony (likely dyed Agate) (Silicon Dioxide (SiO₂)) — mineral

Blue Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO₂)

Olivine/Peridot (Magnesium Iron Silicate (Mg,Fe)2SiO4) — mineral

Olivine/Peridot

Magnesium Iron Silicate (Mg,Fe)2SiO4

Vesicular Basalt (or Scoraceous Basalt) (Basalt (Vesicular texture)) — igneous

Vesicular Basalt (or Scoraceous Basalt)

Basalt (Vesicular texture)

Basalt (Mafic Igneous Pebble) — igneous

Basalt

Mafic Igneous Pebble

Basalt (Mafic igneous rock (primarily Plagioclase feldspar and Pyroxene)) — igneous

Basalt

Mafic igneous rock (primarily Plagioclase feldspar and Pyroxene)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Dark basalt or basaltic volcanic rock (Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine) — igneous

Dark basalt or basaltic volcanic rock

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Yellow Agate (Chalcedony (cryptocrystalline Quartz), SiO2) — mineral

Yellow Agate

Chalcedony (cryptocrystalline Quartz), SiO2

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

Pumice

Pumice (a highly vesicular volcanic rock)

Quartz-rich pegmatite or quartz vein rock (Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining) — igneous

Quartz-rich pegmatite or quartz vein rock

Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining