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

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

Diorite

Diorite (intermediate intrusive igneous rock)

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

Diorite

Diorite (intermediate intrusive igneous rock)

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

Diorite

Diorite (Intermediate intrusive igneous rock)

Peridot (Olivine) (Olivine (Magnesium Iron Silicate), (Mg,Fe)2SiO4) — mineral

Peridot (Olivine)

Olivine (Magnesium Iron Silicate), (Mg,Fe)2SiO4

Carnelian Agate (Chalcedony (SiO2 with iron oxide impurities)) — mineral

Carnelian Agate

Chalcedony (SiO2 with iron oxide impurities)

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

Basalt

Mafic Igneous Rock (composed primarily of pyroxene and plagioclase)

Grey Basalt or Andesite with Veining (Intermediate to Mafic Extrusive Igneous Rock with Quartz/Calcite Veins) — igneous

Grey Basalt or Andesite with Veining

Intermediate to Mafic Extrusive Igneous Rock with Quartz/Calcite Veins

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

Basalt River Pebble

Basalt (Aphanitic Mafic Igneous Rock)

Likely basalt (Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase, clinopyroxene, and often olivine) — igneous

Likely basalt

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase, clinopyroxene, and often olivine

Dark rounded pebble, likely basalt (Basalt — fine-grained mafic volcanic rock, mainly plagioclase and pyroxene with possible olivine) — igneous

Dark rounded pebble, likely basalt

Basalt — fine-grained mafic volcanic rock, mainly plagioclase and pyroxene with possible olivine

Weathered basalt (likely vesicular basalt) (Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine) — igneous

Weathered basalt (likely vesicular basalt)

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Basalt with Plagioclase Phenocrysts (Basalt) — igneous

Basalt with Plagioclase Phenocrysts

Basalt

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

Vesicular Basalt / Scoria

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

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

Diorite

Diorite (Intermediate intrusive igneous rock)

Pumice (Pumicite / Vesicular Rhyolite) — igneous

Pumice

Pumicite / Vesicular Rhyolite

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

Basalt Pebble

Basalt (Mafic Extrusive Igneous Rock)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Basalt (Beach Pebble) (Basalt) — igneous

Basalt (Beach Pebble)

Basalt

Vesicular Basalt / Scoria (with Iron Oxide Alteration) (Vesicular Basalt) — igneous

Vesicular Basalt / Scoria (with Iron Oxide Alteration)

Vesicular Basalt

Peridotite (Peridotite (composed largely of Olivine and Pyroxene)) — igneous

Peridotite

Peridotite (composed largely of Olivine and Pyroxene)

Basalt with Quartz Vein (Mafic Volcanic Rock with SiO2 intrusion) — igneous

Basalt with Quartz Vein

Mafic Volcanic Rock with SiO2 intrusion

Scoria (Vesicular Mafic Extrusive Igneous Rock) — igneous

Scoria

Vesicular Mafic Extrusive Igneous Rock

Basalt with Weathering Rind (Mafic Volcanic Rock (Primarily Plagioclase and Pyroxene)) — igneous

Basalt with Weathering Rind

Mafic Volcanic Rock (Primarily Plagioclase and Pyroxene)

Granodiorite (Gneissic texture) (Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)) — igneous

Granodiorite (Gneissic texture)

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

Muscovite Mica (Muscovite (KAl2(AlSi3O10)(OH)2)) — mineral

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

Basalt (Basalt) — igneous

Basalt

Basalt

Basalt River Pebble (Basalt) — igneous

Basalt River Pebble

Basalt

Basalt River Pebble (Basalt) — igneous

Basalt River Pebble

Basalt

Basalt River Stone (Aphanitic Basalt) — igneous

Basalt River Stone

Aphanitic Basalt

Basalt (Basalt) — igneous

Basalt

Basalt

Basalt (Black Beach Pebble) (Basalt) — igneous

Basalt (Black Beach Pebble)

Basalt

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt (Basalt (Mafic Extrusive)) — igneous

Basalt

Basalt (Mafic Extrusive)

Amygdaloidal Basalt with Agate/Quartz Infill (Basalt with Secondary Silicate Mineralization (SiO2)) — igneous

Amygdaloidal Basalt with Agate/Quartz Infill

Basalt with Secondary Silicate Mineralization (SiO2)

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Diorite (with Salt-and-Pepper Texture) (Diorite (Intrusive Igneous Rock)) — igneous

Diorite (with Salt-and-Pepper Texture)

Diorite (Intrusive Igneous Rock)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Basalt with Quartz Veining (Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)) — igneous

Basalt with Quartz Veining

Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)

Obsidian (black volcanic glass) (Obsidian; predominantly rhyolitic volcanic glass, mainly SiO₂ with minor feldspar, quartz, and iron oxides) — igneous

Obsidian (black volcanic glass)

Obsidian; predominantly rhyolitic volcanic glass, mainly SiO₂ with minor feldspar, quartz, and iron oxides

Diorite (or Gabbro / Pegmatitic Intrusive Rock) (Plagioclase-Amphibole Igneous Rock) — igneous

Diorite (or Gabbro / Pegmatitic Intrusive Rock)

Plagioclase-Amphibole Igneous Rock