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

Porphyritic Basalt (Porphyritic Mafic Volcanic Rock) — igneous

Porphyritic Basalt

Porphyritic Mafic Volcanic Rock

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

River Cobble (likely Basalt or Chert) (Basalt (Mafic volcanic rock)) — igneous

River Cobble (likely Basalt or Chert)

Basalt (Mafic volcanic rock)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Basalt (Mafic volcanic rock (Basalt)) — igneous

Basalt

Mafic volcanic rock (Basalt)

Andesite (Andesite (intermediate volcanic rock)) — igneous

Andesite

Andesite (intermediate volcanic rock)

Vesicular Basalt (Iron-Stained) (Mafic Volcanic Rock (Basalt)) — igneous

Vesicular Basalt (Iron-Stained)

Mafic Volcanic Rock (Basalt)

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

Vesicular Basalt

Basalt (Mafic volcanic rock)

Scoria (Vesicular Mafic Extrusive Igneous Rock) — igneous

Scoria

Vesicular Mafic Extrusive Igneous Rock

Tumbled Quartz (Silicon Dioxide (SiO2)) — mineral

Tumbled Quartz

Silicon Dioxide (SiO2)

Quartz (Orange/Pink variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Orange/Pink variety)

Silicon Dioxide (SiO2)

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

Martian Basalt Rock

Extrusive Mafic Igneous Rock (Basalt)

Basalt (Basalt (Vitreous to Fine-grained Extrusive Igneous Rock)) — igneous

Basalt

Basalt (Vitreous to Fine-grained Extrusive Igneous Rock)

Snowflake Obsidian (Obsidian with Cristobalite inclusions (70-75% SiO2)) — igneous

Snowflake Obsidian

Obsidian with Cristobalite inclusions (70-75% SiO2)

Diorite (Diorite) — igneous

Diorite

Diorite

Beach Pebble (likely Basalt or Chert) (Volcanic Basalt / Microcrystalline Quartz) — igneous

Beach Pebble (likely Basalt or Chert)

Volcanic Basalt / Microcrystalline Quartz

Weathered porphyritic volcanic rock (Likely porphyritic andesite or basalt; exact identification requires a fresh surface and testing) — igneous

Weathered porphyritic volcanic rock

Likely porphyritic andesite or basalt; exact identification requires a fresh surface and testing

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

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Kimberlite (Kimberlite (Potassic ultramafic volcanic rock)) — igneous

Kimberlite

Kimberlite (Potassic ultramafic volcanic rock)

Porphyritic Basalt or Andesite (Igneous rock with porphyritic texture) — igneous

Porphyritic Basalt or Andesite

Igneous rock with porphyritic texture

Basalt (Extrusive Igneous Rock (Mafic)) — igneous

Basalt

Extrusive Igneous Rock (Mafic)

Basalt Porphyry (Porphyritic Basalt) — igneous

Basalt Porphyry

Porphyritic Basalt

Basalt Pebble (Extrusive mafic igneous rock) — igneous

Basalt Pebble

Extrusive mafic igneous rock

Basalt River Stone (Aphanitic Mafic Igneous Rock) — igneous

Basalt River Stone

Aphanitic Mafic Igneous Rock

Vesicular Basalt (or Scoria) (Extrusive mafic igneous rock) — igneous

Vesicular Basalt (or Scoria)

Extrusive mafic igneous rock

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

Vesicular Basalt

Basalt (Extrusive Igneous Rock)

Chalcedony (possibly agate or common quartz) (Microcrystalline quartz, SiO₂) — mineral

Chalcedony (possibly agate or common quartz)

Microcrystalline quartz, SiO₂

Crushed Basalt / Diabase Gravel (Basalt / Mafic Igneous Rock) — igneous

Crushed Basalt / Diabase Gravel

Basalt / Mafic Igneous Rock

Diorite (Intermediate Phaneritic Igneous Rock) — igneous

Diorite

Intermediate Phaneritic Igneous Rock

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

Basalt (Micromount)

Extrusive Mafic Igneous Rock

Basalt (Basalt) — igneous

Basalt

Basalt

Basalt (Aphanitic Mafic Igneous Rock) — igneous

Basalt

Aphanitic Mafic Igneous Rock

Tumbled jasper or rhyolitic porphyry (Silicic volcanic rock, likely rhyolite (quartz- and feldspar-rich), possibly jasperized) — igneous

Tumbled jasper or rhyolitic porphyry

Silicic volcanic rock, likely rhyolite (quartz- and feldspar-rich), possibly jasperized

Dark mafic rock, likely basalt (Basalt; chiefly plagioclase feldspar, clinopyroxene, and commonly olivine or iron oxides) — igneous

Dark mafic rock, likely basalt

Basalt; chiefly plagioclase feldspar, clinopyroxene, and commonly olivine or iron oxides

Rounded basalt pebble (Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with minor olivine or magnetite) — igneous

Rounded basalt pebble

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with minor olivine or magnetite

Likely basalt pebble (Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine) — igneous

Likely basalt pebble

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine

Basalt (Vesicular) (Basalt (mostly plagioclase, pyroxene, and olivine)) — igneous

Basalt (Vesicular)

Basalt (mostly plagioclase, pyroxene, and olivine)

Basalt Scoria (Vesicular Basalt) — igneous

Basalt Scoria

Vesicular Basalt

Obsidian with Mahogany Phasing (Volcanic Glass (SiO2 + Fe2O3)) — igneous

Obsidian with Mahogany Phasing

Volcanic Glass (SiO2 + Fe2O3)

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

Vesicular Basalt

Aphanitic Mafic Igneous Rock (with Vesicular Texture)

Quartz Vein in Siltstone (Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix) — metamorphic

Quartz Vein in Siltstone

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix