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 (Road Aggregate Specimen) (Aphanitic mafic volcanic rock) — igneous

Basalt (Road Aggregate Specimen)

Aphanitic mafic volcanic rock

Basalt (Basalt) — igneous

Basalt

Basalt

Weathered basalt or iron-rich volcanic rock (Fine-grained mafic igneous rock, likely basalt; exact identification requires testing) — igneous

Weathered basalt or iron-rich volcanic rock

Fine-grained mafic igneous rock, likely basalt; exact identification requires testing

Dark basalt (likely vesicular basalt) (Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine (approx. SiO₂ 45–52%)) — igneous

Dark basalt (likely vesicular basalt)

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine (approx. SiO₂ 45–52%)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

Basalt (Weathered) (Extrusive mafic volcanic rock) — igneous

Basalt (Weathered)

Extrusive mafic volcanic rock

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Basalt (Basalt (composition of plagioclase feldspar and pyroxene)) — Igneous

Basalt

Basalt (composition of plagioclase feldspar and pyroxene)

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

Basalt Pebble

Basalt (Mafic volcanic rock)

River Stone (Basalt) (Basalt) — igneous

River Stone (Basalt)

Basalt

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

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Porphyry (Porphyritic Basalt / Porphyritic Andesite) — igneous

Porphyry

Porphyritic Basalt / Porphyritic Andesite

Dalmatian Stone (Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)) — igneous

Dalmatian Stone

Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)

Basalt Pebble (Mafic Igneous Basalt) — igneous

Basalt Pebble

Mafic Igneous Basalt

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

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

Basalt River Pebble

Basalt (Mafic Volcanic Rock)

Porphyry (Porphyritic Igneous Rock) — igneous

Porphyry

Porphyritic Igneous Rock

Amygdaloidal Basalt (Amygdaloidal Basalt) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Amethyst (Silicon dioxide (SiO2)) — mineral

Amethyst

Silicon dioxide (SiO2)

Basalt (Vesicular Basalt) — igneous

Basalt

Vesicular Basalt

Clear Quartz (Rock Crystal) Bracelet (Silicon Dioxide (SiO2)) — gemstone

Clear Quartz (Rock Crystal) Bracelet

Silicon Dioxide (SiO2)

Basalt (River Pebble) (Mafic volcanic rock (rich in magnesium and iron)) — igneous

Basalt (River Pebble)

Mafic volcanic rock (rich in magnesium and iron)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Basalt (Basalt (extrusive igneous rock)) — igneous

Basalt

Basalt (extrusive igneous rock)

Basalt (Mafic Igneous Rock (Basalt)) — igneous

Basalt

Mafic Igneous Rock (Basalt)

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

Quartz (Druzy)

Silicon Dioxide (SiO2)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Dark coarse-grained rock, likely basalt or gabbro (Basalt (fine-grained) or gabbro (coarse-grained), composed mainly of plagioclase feldspar and pyroxene) — igneous

Dark coarse-grained rock, likely basalt or gabbro

Basalt (fine-grained) or gabbro (coarse-grained), composed mainly of plagioclase feldspar and pyroxene

Dark fine-grained river pebble, likely basalt or diabase (Basaltic rock; chiefly plagioclase feldspar and pyroxene, with possible magnetite) — igneous

Dark fine-grained river pebble, likely basalt or diabase

Basaltic rock; chiefly plagioclase feldspar and pyroxene, with possible magnetite

Basalt Pebble (Basalt (SiO2 range 45-52%)) — igneous

Basalt Pebble

Basalt (SiO2 range 45-52%)

Vesicular Basalt (Basalt (Mafic Extrusive)) — igneous

Vesicular Basalt

Basalt (Mafic Extrusive)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Porphyritic Granite (or Porphyry) (Porphyritic Igneous Rock) — igneous

Porphyritic Granite (or Porphyry)

Porphyritic Igneous Rock

Porphyry (Porphyritic Basalt or Andesite) (Porphyritic Igneous Rock) — igneous

Porphyry (Porphyritic Basalt or Andesite)

Porphyritic Igneous Rock

Basalt with Olivine (Extrusive Mafic Igneous Rock) — igneous

Basalt with Olivine

Extrusive Mafic Igneous Rock

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

Agate

Silicon Dioxide (Chalcedony), SiO2

Basalt (River Stone) (Basalt) — igneous

Basalt (River Stone)

Basalt

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

Obsidian Jewelry Piece

Volcanic Glass (SiO2 + impurities)

Basalt (Basalt (Mafic igneous rock)) — igneous

Basalt

Basalt (Mafic igneous rock)

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

Vesicular Basalt

Basalt (Mafic Extrusive Volcanic Rock)