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

Rhyolitic jasper / brecciated jasper (Silica-rich volcanic rock, chiefly microcrystalline quartz (SiO₂), with iron-oxide and clay/mineral impurities) — igneous

Rhyolitic jasper / brecciated jasper

Silica-rich volcanic rock, chiefly microcrystalline quartz (SiO₂), with iron-oxide and clay/mineral impurities

Granite Pebble (Phaneritic Felsic Igneous Rock) — igneous

Granite Pebble

Phaneritic Felsic Igneous Rock

Vesicular Basalt (or Scoria) (Vesicular Basalt) — igneous

Vesicular Basalt (or Scoria)

Vesicular Basalt

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions

Basalt with Quartz/Feldspar Inclusions (Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining) — igneous

Basalt with Quartz/Feldspar Inclusions

Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining

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

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Basalt (Basalt (aphanitic mafic volcanic rock)) — igneous

Basalt

Basalt (aphanitic mafic volcanic rock)

Granite Pebble (Granite) — igneous

Granite Pebble

Granite

Basalt (Water-worn Pebble) (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt (Water-worn Pebble)

Basalt (Aphanitic Mafic Igneous Rock)

Quartz Veined Basalt (Mafic Igneous Rock with Quartz (SiO2) intrusion) — igneous

Quartz Veined Basalt

Mafic Igneous Rock with Quartz (SiO2) intrusion

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Sand Grain / Micro Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Sand Grain / Micro Crystal

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Pumice (Pumice) — igneous

Pumice

Pumice

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Diorite (Diorite (Intermediate plutonic rock)) — igneous

Diorite

Diorite (Intermediate plutonic rock)

Basalt Xenolith in Matrix (Basaltic Mafic Xenolith / Ultra-mafic Inclusion) — igneous

Basalt Xenolith in Matrix

Basaltic Mafic Xenolith / Ultra-mafic Inclusion

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

Vesicular Basalt

Extrusive Mafic Igneous Rock (Vesicular Basalt)

Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)

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

Black Obsidian

Obsidian / Amorphous volcanic glass (SiO2)

Diorite (Phaneritic intermediate plutonic rock) — igneous

Diorite

Phaneritic intermediate plutonic rock

Dark mafic igneous rock, likely basalt or gabbro (Basalt–gabbroic rock; mainly plagioclase feldspar and pyroxene, possibly olivine or magnetite) — igneous

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; mainly plagioclase feldspar and pyroxene, possibly olivine or magnetite

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Granodiorite (Granodiorite (containing Plagioclase, Quartz, and Biotite/Amphibole)) — igneous

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and Biotite/Amphibole)

Pumice (Pumice) — igneous

Pumice

Pumice

Porphyritic Basalt (Porphyritic Basalt (containing Plagioclase phenocrysts)) — igneous

Porphyritic Basalt

Porphyritic Basalt (containing Plagioclase phenocrysts)

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

Chinese Writing Stone

Porphyritic Basalt or Porphyritic Andesite

Basalt (River Stone) (Basalt (Aphanitic mafic volcanic rock)) — igneous

Basalt (River Stone)

Basalt (Aphanitic mafic volcanic rock)

Basalt (Basalt (Aphanitic Mafic Volcanic Rock)) — igneous

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Porphyritic Rhyolite (Porphyritic Rhyolite (Extrusive Igneous Rock)) — igneous

Porphyritic Rhyolite

Porphyritic Rhyolite (Extrusive Igneous Rock)

Basalt with Desert Varnish (Mafic Igneous Rock with Ferromanganese Coating) — igneous

Basalt with Desert Varnish

Mafic Igneous Rock with Ferromanganese Coating

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

Diorite

Diorite (Intermediate intrusive igneous rock)

Snowflake Obsidian (Volcanic Glass with Cristobalite Inclusions) — igneous

Snowflake Obsidian

Volcanic Glass with Cristobalite Inclusions

White Quartz (Silicon Dioxide (SiO2)) — mineral

White Quartz

Silicon Dioxide (SiO2)

Plume Agate or Moss Agate (Agate (SiO2)) — mineral

Plume Agate or Moss Agate

Agate (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Microcrystalline/Gravel) (Silicon Dioxide (SiO2)) — mineral

Quartz (Microcrystalline/Gravel)

Silicon Dioxide (SiO2)

Peridotite / Olivine-rich Xenolith (Ultramafic igneous rock (predominantly olivine and pyroxene)) — igneous

Peridotite / Olivine-rich Xenolith

Ultramafic igneous rock (predominantly olivine and pyroxene)

Diorite river stone (Intermediate Plutonic Igneous Rock (Diorite)) — igneous

Diorite river stone

Intermediate Plutonic Igneous Rock (Diorite)

Vesicular basalt (probable) (Basalt, mainly plagioclase feldspar and pyroxene, with possible olivine and iron oxides) — igneous

Vesicular basalt (probable)

Basalt, mainly plagioclase feldspar and pyroxene, with possible olivine and iron oxides

Basalt (Vesicular Basalt (Mafic volcanic rock)) — Igneous

Basalt

Vesicular Basalt (Mafic volcanic rock)