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 (River Stone) (Basalt (composed mostly of plagioclase, pyroxene, and olivine)) — igneous

Basalt (River Stone)

Basalt (composed mostly of plagioclase, pyroxene, and olivine)

Gray Basalt Cobble (Basalt) — igneous

Gray Basalt Cobble

Basalt

Vesicular Basalt (Basalt (principally Plagioclase and Pyroxene)) — igneous

Vesicular Basalt

Basalt (principally Plagioclase and Pyroxene)

Basalt (River Stone) (Basalt) — igneous

Basalt (River Stone)

Basalt

Basalt (Mafic Igneous Basalt) — igneous

Basalt

Mafic Igneous Basalt

Mahogany Obsidian (Natural Volcanic Glass (SiO2 with iron and magnesium oxides)) — igneous

Mahogany Obsidian

Natural Volcanic Glass (SiO2 with iron and magnesium oxides)

Basalt with Olivine Phenocrysts (Porphyritic Basalt (containing Mg2SiO4 - Fe2SiO4)) — igneous

Basalt with Olivine Phenocrysts

Porphyritic Basalt (containing Mg2SiO4 - Fe2SiO4)

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

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basaltic Andesite

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

Porphyritic Basalt

Porphyritic Basalt (Mafic Igneous Rock)

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

Scoria (Basaltic Lava Rock)

Vesicular Basalt

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Snowflake Obsidian (Volcanic Glass (SiO2 rich with Cristobalite inclusions)) — igneous

Snowflake Obsidian

Volcanic Glass (SiO2 rich with Cristobalite inclusions)

Milky Quartz with Iron Inclusions (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Granite (Phaneritic Felsic Igneous Rock (Granite)) — igneous

Granite

Phaneritic Felsic Igneous Rock (Granite)

Basalt with Plagioclase Porphyry (Porphyritic Basalt) — igneous

Basalt with Plagioclase Porphyry

Porphyritic Basalt

Scoria (Lava Rock) (Scoria (basaltic pyroclastic rock)) — igneous

Scoria (Lava Rock)

Scoria (basaltic pyroclastic rock)

Kimberlite with Diamond (Kimberlite (Porphyritic Peridotite)) — igneous

Kimberlite with Diamond

Kimberlite (Porphyritic Peridotite)

Banded Chalcedony (Agate) in Basalt Matrix (Cryptocrystalline Quartz (SiO2) in Mafic Igneous Rock) — sedimentary/igneous

Banded Chalcedony (Agate) in Basalt Matrix

Cryptocrystalline Quartz (SiO2) in Mafic Igneous Rock

sedimentary/igneous

Orthoclase Feldspar (KAlSi3O8 (Potassium Aluminum Silicate)) — mineral

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Basalt with Quartz Vein (Basalt (Mafic volcanic rock) with secondary Quartz (SiO2) intrusion) — igneous

Basalt with Quartz Vein

Basalt (Mafic volcanic rock) with secondary Quartz (SiO2) intrusion

Quartz (Iron-Stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Obsidian (Obsidian (volcanic glass; primarily SiO2)) — igneous

Obsidian

Obsidian (volcanic glass; primarily SiO2)

Basalt (with possible weathered crust) (Basalt (composition: Plagioclase feldspar, Pyroxene, Olivine)) — igneous

Basalt (with possible weathered crust)

Basalt (composition: Plagioclase feldspar, Pyroxene, Olivine)

Vesicular Basalt (Basalt) — igneous

Vesicular Basalt

Basalt

Dark flint or chert fragment (Microcrystalline quartz (SiO₂), commonly called flint when dark and nodular) — sedimentary

Dark flint or chert fragment

Microcrystalline quartz (SiO₂), commonly called flint when dark and nodular

Basalt Cobble (Basalt) — igneous

Basalt Cobble

Basalt

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

Basalt Pebble

Basalt (Aphanitic Mafic Igneous Rock)

Vesicular Rhyolite (Rhyolite (High-silica volcanic rock)) — igneous

Vesicular Rhyolite

Rhyolite (High-silica volcanic rock)

Quartz (Cut and Polished Sphere) (Silicon Dioxide (SiO2)) — mineral

Quartz (Cut and Polished Sphere)

Silicon Dioxide (SiO2)

Polished black agate slice (Chalcedony (microcrystalline quartz), SiO₂, with iron/manganese staining) — mineral

Polished black agate slice

Chalcedony (microcrystalline quartz), SiO₂, with iron/manganese staining

Basalt Pebble (Aphanitic mafic extrusive igneous rock) — igneous

Basalt Pebble

Aphanitic mafic extrusive igneous rock

Basalt with Quartz/Calcite matrix (Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix) — igneous

Basalt with Quartz/Calcite matrix

Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix

Diorite (Diorite (Intermediate intrusive igneous rock)) — igneous

Diorite

Diorite (Intermediate intrusive igneous rock)

Basalt (with Porphyritic/Vesicular texture) (Extrusive mafic igneous rock) — igneous

Basalt (with Porphyritic/Vesicular texture)

Extrusive mafic igneous rock

Basalt (Extrusive Mafic Igneous Rock) — igneous

Basalt

Extrusive Mafic Igneous Rock

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

Basalt (River Stone)

Aphanitic Mafic Igneous Rock

Fine-grained gray sandstone or quartz-rich sedimentary pebble (Likely quartz arenite or lithic sandstone; exact identification requires microscopy or testing) — sedimentary

Fine-grained gray sandstone or quartz-rich sedimentary pebble

Likely quartz arenite or lithic sandstone; exact identification requires microscopy or testing

Scoria (Scoriaceous Basalt) — igneous

Scoria

Scoriaceous Basalt

Quartz with Mica/Host Rock (Silicon Dioxide (SiO2) with Phyllosilicates) — mineral

Quartz with Mica/Host Rock

Silicon Dioxide (SiO2) with Phyllosilicates

Basalt (Basalt (containing plagioclase, pyroxene, and olivine)) — igneous

Basalt

Basalt (containing plagioclase, pyroxene, and olivine)

Basalt with Vesicles (Vesicular Basalt) — igneous

Basalt with Vesicles

Vesicular Basalt

Basalt with Amygdaloidal Inclusions (Aphanitic Mafic Volcanic Rock (Basalt)) — igneous

Basalt with Amygdaloidal Inclusions

Aphanitic Mafic Volcanic Rock (Basalt)