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

Greenstone / Greenschist (Greenschist (metamorphosed mafic rock)) — metamorphic

Greenstone / Greenschist

Greenschist (metamorphosed mafic rock)

Pink Granite (River Pebble) (Phaneritic Felsic Igneous Rock) — igneous

Pink Granite (River Pebble)

Phaneritic Felsic Igneous Rock

Beach Pebble (Basalt / Greywacke) (Basalt (or fine-grained Sedimentary Greywacke)) — igneous

Beach Pebble (Basalt / Greywacke)

Basalt (or fine-grained Sedimentary Greywacke)

Obsidian (Volcanic glass (SiO2 - Silicon Dioxide)) — Igneous

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Pumice (Pumice (Vesicular Rhyolite/Andesite)) — igneous

Pumice

Pumice (Vesicular Rhyolite/Andesite)

Iron-rich chert or jasper (Microcrystalline quartz (SiO₂), colored by hematite/goethite inclusions) — sedimentary

Iron-rich chert or jasper

Microcrystalline quartz (SiO₂), colored by hematite/goethite inclusions

Yellow-brown quartz/chalcedony fragment (Quartz, SiO₂; likely microcrystalline chalcedony with iron-oxide staining) — mineral

Yellow-brown quartz/chalcedony fragment

Quartz, SiO₂; likely microcrystalline chalcedony with iron-oxide staining

Kimberlite (Kimberlite) — igneous

Kimberlite

Kimberlite

Pink Granite (River Pebble) (Phaneritic Felsic Igneous Rock) — igneous

Pink Granite (River Pebble)

Phaneritic Felsic Igneous Rock

Granite Pebble (Phaneritic Felsic Igneous Rock) — igneous

Granite Pebble

Phaneritic Felsic Igneous Rock

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Pink Granite (Phaneritic Felsic Igneous Rock) — igneous

Pink Granite

Phaneritic Felsic Igneous Rock

Pink Granite (Plagioclase-Quartz-K-Feldspar Granite) — igneous

Pink Granite

Plagioclase-Quartz-K-Feldspar Granite

Greenstone / Basalt (Metabasalt (often containing Chlorite, Epidote, and Actinolite)) — igneous

Greenstone / Basalt

Metabasalt (often containing Chlorite, Epidote, and Actinolite)

Basalt (Mafic Igneous Rock (composed of plagioclase feldspar and pyroxene)) — igneous

Basalt

Mafic Igneous Rock (composed of plagioclase feldspar and pyroxene)

Basalt (Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Leopard Skin Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Leopard Skin Jasper

Silicon Dioxide (SiO2) with impurities

Kimberlite with Diamonds (Kimberlite (ultramafic potassic igneous rock)) — igneous

Kimberlite with Diamonds

Kimberlite (ultramafic potassic igneous rock)

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

Diorite

Intermediate Phaneritic Igneous Rock (Diorite)

Scoria (Lava Rock) (Aphanitic vesicular mafic igneous rock) — igneous

Scoria (Lava Rock)

Aphanitic vesicular mafic igneous rock

Diorite (Diorite (intermediate intrusive igneous rock)) — igneous

Diorite

Diorite (intermediate intrusive igneous rock)

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

Diorite (River Pebble)

Diorite (Intermediate intrusive igneous rock)

Dalmatian Jasper (Peralkaline rhyolite) — igneous

Dalmatian Jasper

Peralkaline rhyolite

Polymictic breccia, possibly volcanic breccia (Polymictic clastic breccia; likely a matrix-supported breccia containing lithic fragments, quartz, feldspar, and dark mafic minerals) — sedimentary

Polymictic breccia, possibly volcanic breccia

Polymictic clastic breccia; likely a matrix-supported breccia containing lithic fragments, quartz, feldspar, and dark mafic minerals

Greenstone (Metabasalt (Greenstone)) — metamorphic

Greenstone

Metabasalt (Greenstone)

Porphyritic Basalt (Porphyritic Fine-grained Mafic Volcanic Rock) — igneous

Porphyritic Basalt

Porphyritic Fine-grained Mafic Volcanic Rock

Milky Quartz (Quartz (Silicon Dioxide - SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

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

Vesicular Basalt

Vesicular Basalt (Aphanitic Mafic Igneous Rock)

Basalt with Sulfide/Pyrite inclusion (Aphanitic Mafic Igneous Rock (likely Basalt) with Pyrite (FeS2)) — igneous

Basalt with Sulfide/Pyrite inclusion

Aphanitic Mafic Igneous Rock (likely Basalt) with Pyrite (FeS2)

Black Pebble (Basalt / Chert) (SiO2 (if Chert) or Mafic Igneous Rock (if Basalt)) — igneous

Black Pebble (Basalt / Chert)

SiO2 (if Chert) or Mafic Igneous Rock (if Basalt)

Polished black gemstone, likely black obsidian (Obsidian (volcanic glass), chiefly silica-rich amorphous SiO₂) — igneous

Polished black gemstone, likely black obsidian

Obsidian (volcanic glass), chiefly silica-rich amorphous SiO₂

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

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Granite (Pink/Alkali Feldspar Granite) (Plutonic Igneous Rock (Granite)) — igneous

Granite (Pink/Alkali Feldspar Granite)

Plutonic Igneous Rock (Granite)

Pink Granite (Unakite-bearing or Epidote-bearing Granite) (Plutonic Igneous Rock (Granite)) — igneous

Pink Granite (Unakite-bearing or Epidote-bearing Granite)

Plutonic Igneous Rock (Granite)

Diabase (Diabase (Dolerite)) — igneous

Diabase

Diabase (Dolerite)

Basalt with Amygdules (Amygdaloidal Basalt) — igneous

Basalt with Amygdules

Amygdaloidal Basalt

Likely weathered basalt or dark volcanic rock (Basalt; primarily plagioclase feldspar and pyroxene, with possible olivine and iron oxides) — igneous

Likely weathered basalt or dark volcanic rock

Basalt; primarily plagioclase feldspar and pyroxene, with possible olivine and iron oxides

Basalt Pebble (Extrusive Aphanitic Basalt) — igneous

Basalt Pebble

Extrusive Aphanitic Basalt

Blue Quartz (Aventurine) (Silicon Dioxide (SiO2) with inclusions of crocidolite or dumortierite) — mineral

Blue Quartz (Aventurine)

Silicon Dioxide (SiO2) with inclusions of crocidolite or dumortierite

Clear Quartz (Silicon dioxide (SiO2)) — mineral

Clear Quartz

Silicon dioxide (SiO2)

Basalt (with weathered crust) (Basalt) — igneous

Basalt (with weathered crust)

Basalt