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

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Peridotite (Peridotite (varieties include Dunite, Lherzolite, Harzburgite)) — igneous

Peridotite

Peridotite (varieties include Dunite, Lherzolite, Harzburgite)

Scoria (Vesicular Basalt / Scoria) — igneous

Scoria

Vesicular Basalt / Scoria

Porphyry (specifically Porphyritic Basalt or Andesite) (Porphyritic extrusive igneous rock (Mg,Fe)2SiO4 (Olivine inclusions/Plagioclase Feldspar)) — igneous

Porphyry (specifically Porphyritic Basalt or Andesite)

Porphyritic extrusive igneous rock (Mg,Fe)2SiO4 (Olivine inclusions/Plagioclase Feldspar)

Quartz Pebble (Silicon Dioxide (SiO2) Pebble) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2) Pebble

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

Scoria (Lava Rock)

Vesicular Basalt / Scoria

Basalt (Basalt) — igneous

Basalt

Basalt

Amethyst (Quartz (Silicon Dioxide with Iron impurities), SiO2) — mineral

Amethyst

Quartz (Silicon Dioxide with Iron impurities), SiO2

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

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

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

Jasper

Silicon Dioxide (SiO2) with impurities

Pink-gray granite (Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende) — igneous

Pink-gray granite

Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

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

Basalt

Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Porphyritic Basalt (likely artificially dyed or altered) (Basalt with plagioclase phenocrysts (likely treated)) — igneous

Porphyritic Basalt (likely artificially dyed or altered)

Basalt with plagioclase phenocrysts (likely treated)

Quartz Grain (Silicon Dioxide (SiO2)) — mineral

Quartz Grain

Silicon Dioxide (SiO2)

Basalt with Quartz Vein (Basalt (extrusive igneous rock) with Quartz (SiO2) inclusion) — igneous

Basalt with Quartz Vein

Basalt (extrusive igneous rock) with Quartz (SiO2) inclusion

Porphyritic Basalt (Basalt with Plagioclase phenocrysts) — igneous

Porphyritic Basalt

Basalt with Plagioclase phenocrysts

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Vesicular Basalt / Lava Rock (Extrusive mafic igneous rock (Mafic silicate)) — igneous

Vesicular Basalt / Lava Rock

Extrusive mafic igneous rock (Mafic silicate)

Pumice (Pumice) — igneous

Pumice

Pumice

Granodiorite (Granodiorite (containing Plagioclase, Quartz, and K-feldspar)) — igneous

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and K-feldspar)

Scoria (Lava Rock) (Scoria (Vesicular Basaltic Rock)) — Igneous

Scoria (Lava Rock)

Scoria (Vesicular Basaltic Rock)

Peridotite (Olivine) (Peridotite (comprising (Mg,Fe)2SiO4)) — igneous

Peridotite (Olivine)

Peridotite (comprising (Mg,Fe)2SiO4)

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Milky Quartz with Matrix (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Matrix

Silicon Dioxide (SiO2)

Obsidian (Amorphous volcanic glass (principally SiO2)) — igneous

Obsidian

Amorphous volcanic glass (principally SiO2)

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

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Carnelian Agate (with Quartz/Chalcedony) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Carnelian Agate (with Quartz/Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Peridotite (Ultramafic intrusive igneous rock (composition: (Mg, Fe)2SiO4)) — igneous

Peridotite

Ultramafic intrusive igneous rock (composition: (Mg, Fe)2SiO4)

Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Vesicular basalt (likely weathered lava rock) (Basalt; fine-grained mafic volcanic rock composed chiefly of plagioclase, pyroxene, and commonly olivine) — igneous

Vesicular basalt (likely weathered lava rock)

Basalt; fine-grained mafic volcanic rock composed chiefly of plagioclase, pyroxene, and commonly olivine

Diorite (Diorite (Intermediate Plutonic Rock)) — igneous

Diorite

Diorite (Intermediate Plutonic Rock)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Milky Quartz Pebbles

Silicon Dioxide (SiO2)

Tumbled Amethyst (Quartz (Silicon Dioxide, SiO2, colored by iron impurities)) — mineral

Tumbled Amethyst

Quartz (Silicon Dioxide, SiO2, colored by iron impurities)

Weathered river stones, likely basaltic andesite and related volcanic rocks (Fine-grained mafic/intermediate volcanic rocks; commonly basalt (plagioclase + pyroxene ± olivine) or andesite (plagioclase + pyroxene ± amphibole)) — igneous

Weathered river stones, likely basaltic andesite and related volcanic rocks

Fine-grained mafic/intermediate volcanic rocks; commonly basalt (plagioclase + pyroxene ± olivine) or andesite (plagioclase + pyroxene ± amphibole)

Granite (Granite; primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende) — igneous

Granite

Granite; primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende

Quartz Boulder (Silicon Dioxide (SiO2)) — mineral

Quartz Boulder

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Weathered granite (likely biotite granite) (Granite; interlocking quartz, feldspar, and mica, commonly with biotite) — igneous

Weathered granite (likely biotite granite)

Granite; interlocking quartz, feldspar, and mica, commonly with biotite