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

Pumice (Pumice (Vesicular Felsic Igneous Rock)) — igneous

Pumice

Pumice (Vesicular Felsic Igneous Rock)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt (Basalt (Aphanitic Mafic Rock)) — igneous

Basalt

Basalt (Aphanitic Mafic Rock)

Vesicular Rhyolite (Extrusive igneous rock (high-silica rhyolite)) — igneous

Vesicular Rhyolite

Extrusive igneous rock (high-silica rhyolite)

Chalcedony (Agate / Moss Agate) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate / Moss Agate)

Silicon Dioxide (SiO2)

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt) — igneous

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Basalt with Porphyritic Texture (Porphyritic Basalt) — igneous

Basalt with Porphyritic Texture

Porphyritic Basalt

Scoria (Vesicular Basalt) (Extrusive mafic igneous rock (high vesicularity)) — igneous

Scoria (Vesicular Basalt)

Extrusive mafic igneous rock (high vesicularity)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2) within Sedimentary or Igneous host) — mineral

Quartz Geode

Silicon Dioxide (SiO2) within Sedimentary or Igneous host

Granite Cobble (Phaneritic Felsic Igneous Rock) — igneous

Granite Cobble

Phaneritic Felsic Igneous Rock

Quartz (Smoky Quartz variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

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

Quartz Crystal Rock

Silicon Dioxide (SiO2)

Pumice (likely) (Pumice (extrusive igneous rock)) — Igneous

Pumice (likely)

Pumice (extrusive igneous rock)

Black Obsidian (Amorphous volcanic glass (primarily SiO2)) — igneous

Black Obsidian

Amorphous volcanic glass (primarily SiO2)

Basalt (River Pebble) (Basalt) — igneous

Basalt (River Pebble)

Basalt

Basalt with Quartz Vein (Basalt (SiO2 vein inclusion)) — igneous

Basalt with Quartz Vein

Basalt (SiO2 vein inclusion)

Quartz Crystal Point (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Point

Silicon Dioxide (SiO2)

Granite (Intrusive Felsic Igneous Rock) — igneous

Granite

Intrusive Felsic Igneous Rock

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Kimberlite (Kimberlite (Potassic ultramafic igneous rock)) — igneous

Kimberlite

Kimberlite (Potassic ultramafic igneous rock)

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

Porphyritic Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt with Quartz Vein (Aphanitic Mafic Igneous Rock with Silicon Dioxide (SiO2) inclusion) — igneous

Basalt with Quartz Vein

Aphanitic Mafic Igneous Rock with Silicon Dioxide (SiO2) inclusion

Mahogany Obsidian (Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)) — igneous

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)

Vesicular Basalt (Scoria) (Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)) — igneous

Vesicular Basalt (Scoria)

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Dalmatian jasper (Dalmatian stone; commonly a leucocratic alkali-feldspar-rich igneous rock with arfvedsonite or aegirine inclusions) — igneous

Dalmatian jasper

Dalmatian stone; commonly a leucocratic alkali-feldspar-rich igneous rock with arfvedsonite or aegirine inclusions

Porphyritic Basalt (Porphyritic Mafic Extrusive Rock) — igneous

Porphyritic Basalt

Porphyritic Mafic Extrusive Rock

Diorite (Phaneritic Intrusive Igneous Rock (Intermediate Composition)) — igneous

Diorite

Phaneritic Intrusive Igneous Rock (Intermediate Composition)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Crystal Point (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Point

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

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

Agate

Silicon Dioxide (Chalcedony), SiO2

Basalt with Plagioclase Phenocryst (Porphyritic Basalt) — igneous

Basalt with Plagioclase Phenocryst

Porphyritic Basalt

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Thunderegg (Agate Geode) (Agate/Chalcedony filled Rhyolite nodule (SiO2)) — igneous

Thunderegg (Agate Geode)

Agate/Chalcedony filled Rhyolite nodule (SiO2)

Basalt cobble (Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene) — igneous

Basalt cobble

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

Polished basalt (vesicular basalt pebble) (Basalt, primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides) — igneous

Polished basalt (vesicular basalt pebble)

Basalt, primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt) (Porphyritic Basalt (primarily SiO2, Al2O3, FeO, MgO, CaO)) — igneous

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)

Porphyritic Basalt (primarily SiO2, Al2O3, FeO, MgO, CaO)

Basalt with Pahoehoe flow texture (Vesicular Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt with Pahoehoe flow texture

Vesicular Basalt (Aphanitic Mafic Igneous Rock)

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

Scoria (Lava Rock)

Vesicular Basalt / Scoria