Rock Identifier

Category

Volcanic Glass (Igneous)

Browse volcanic glass (igneous) specimens identified by the Rock Identifier community.

Learn about Volcanic Glass (Igneous) in the encyclopedia

Black Obsidian

Pink Obsidian

Sideromelane

Obsidian

Tachylite

Perlite

Yellow Obsidian

Yellow Obsidian

Turquoise Obsidian

Teal Obsidian

Green Sheen Obsidian

Clear Obsidian

Cobalt Blue Obsidian

Obsidian (Volcanic glass (high silica volcanic rock)) — igneous

Obsidian

Volcanic glass (high silica volcanic rock)

Pumice (Vesicular volcanic glass (primarily SiO2)) — igneous

Pumice

Vesicular volcanic glass (primarily SiO2)

Basalt (Basalt (Extrusive volcanic rock)) — igneous

Basalt

Basalt (Extrusive volcanic rock)

Obsidian (likely black volcanic glass) (Obsidian; predominantly rhyolitic glass, mainly SiO₂) — igneous

Obsidian (likely black volcanic glass)

Obsidian; predominantly rhyolitic glass, mainly SiO₂

Black obsidian (Volcanic glass, predominantly rhyolitic silica glass (approximately 70–80% SiO₂)) — igneous

Black obsidian

Volcanic glass, predominantly rhyolitic silica glass (approximately 70–80% SiO₂)

Pumice (Pumicite) — igneous

Pumice

Pumicite

Felsic Tuff (Pyroclastic volcanic rock (Tuff)) — igneous

Felsic Tuff

Pyroclastic volcanic rock (Tuff)

Pumice (or Volcanic Tuff / Ash) (Pumice / Pyroclastic rock) — igneous

Pumice (or Volcanic Tuff / Ash)

Pumice / Pyroclastic rock

Pumice (Pumice (Vesicular Felsic Igneous Rock)) — igneous

Pumice

Pumice (Vesicular Felsic Igneous Rock)

Polished mahogany obsidian (Volcanic glass, primarily rhyolitic composition (SiO₂-rich); mahogany coloration from iron-oxide inclusions) — igneous

Polished mahogany obsidian

Volcanic glass, primarily rhyolitic composition (SiO₂-rich); mahogany coloration from iron-oxide inclusions

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

Pumice

Pumice (Vesicular Rhyolite/Dacite)

Banded Rhyolite (or Gray Shale pebble) (Rhyolite (SiO2 with minor impurities)) — igneous

Banded Rhyolite (or Gray Shale pebble)

Rhyolite (SiO2 with minor impurities)

Weathered rhyolite or volcanic tuff (Silica-rich extrusive igneous rock, likely rhyolite; exact identification requires testing) — igneous

Weathered rhyolite or volcanic tuff

Silica-rich extrusive igneous rock, likely rhyolite; exact identification requires testing

Pumice (Pumice (a highly vesicular, silicic volcanic rock)) — igneous

Pumice

Pumice (a highly vesicular, silicic volcanic rock)

Pumice (Pumice (SiO2)) — igneous

Pumice

Pumice (SiO2)

Obsidian (Obsidian (Volcanic glass, primarily SiO2)) — igneous

Obsidian

Obsidian (Volcanic glass, primarily SiO2)

Tumbled mahogany obsidian (Volcanic glass, predominantly rhyolitic silica (SiO₂), with iron-oxide inclusions) — igneous

Tumbled mahogany obsidian

Volcanic glass, predominantly rhyolitic silica (SiO₂), with iron-oxide inclusions

Black obsidian (polished/tumbled) (Volcanic glass; primarily silica-rich rhyolitic glass (approximately 70–80% SiO₂)) — igneous

Black obsidian (polished/tumbled)

Volcanic glass; primarily silica-rich rhyolitic glass (approximately 70–80% SiO₂)

Snowflake Obsidian (Volcanic Glass with Cristobalite inclusions (SiO2)) — igneous

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions (SiO2)

Black obsidian (Volcanic glass, primarily rhyolitic silica glass (SiO₂-rich, noncrystalline)) — igneous

Black obsidian

Volcanic glass, primarily rhyolitic silica glass (SiO₂-rich, noncrystalline)

Red Obsidian (Volcanic Glass (Amorphous SiO2)) — igneous

Red Obsidian

Volcanic Glass (Amorphous SiO2)

Pumice (Pumice (Vesicular volcanic glass)) — Igneous

Pumice

Pumice (Vesicular volcanic glass)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Obsidian (Volcanic Glass (Amorphous SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous SiO2)

Spherulitic Rhyolite / Leopard Skin Rhyolite (Extrusive felsic igneous rock with spherulites) — igneous

Spherulitic Rhyolite / Leopard Skin Rhyolite

Extrusive felsic igneous rock with spherulites

Obsidian-like volcanic rock (likely basaltic volcanic glass) (Basaltic obsidian or tachylite; composition chiefly volcanic glass with plagioclase and pyroxene) — igneous

Obsidian-like volcanic rock (likely basaltic volcanic glass)

Basaltic obsidian or tachylite; composition chiefly volcanic glass with plagioclase and pyroxene

Pumice (Pumice (a highly vesicular volcanic rock)) — igneous

Pumice

Pumice (a highly vesicular volcanic rock)

Snowflake Obsidian (Snowflake Obsidian (Volcanic Glass)) — igneous

Snowflake Obsidian

Snowflake Obsidian (Volcanic Glass)

Scoria (vesicular basalt) (Scoria; vesicular mafic volcanic rock, typically basaltic in composition) — igneous

Scoria (vesicular basalt)

Scoria; vesicular mafic volcanic rock, typically basaltic in composition

Black obsidian cabochon or sphere (Obsidian (volcanic glass), chiefly SiO₂) — igneous

Black obsidian cabochon or sphere

Obsidian (volcanic glass), chiefly SiO₂

Gold Sheen Obsidian (Volcanic Glass (SiO2 + H2O + Fe2O3)) — igneous

Gold Sheen Obsidian

Volcanic Glass (SiO2 + H2O + Fe2O3)

Pumice (Pumice (a highly vesicular volcanic glass)) — igneous

Pumice

Pumice (a highly vesicular volcanic glass)

Educational Geologic Collection (Mixed Mineral and Rock Collection (Various compositions)) — mineral

Educational Geologic Collection

Mixed Mineral and Rock Collection (Various compositions)

Polished black stone, likely obsidian (Volcanic glass; chiefly amorphous SiO₂) — igneous

Polished black stone, likely obsidian

Volcanic glass; chiefly amorphous SiO₂

Snowflake Obsidian (Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)) — igneous

Snowflake Obsidian

Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)

Scoria (vesicular basalt) (Basaltic scoria; chiefly plagioclase, clinopyroxene, olivine, and volcanic glass) — igneous

Scoria (vesicular basalt)

Basaltic scoria; chiefly plagioclase, clinopyroxene, olivine, and volcanic glass

Obsidian (volcanic glass) (Obsidian, natural rhyolitic glass; predominantly SiO₂) — igneous

Obsidian (volcanic glass)

Obsidian, natural rhyolitic glass; predominantly SiO₂

Pumice (Vesicular Rhyolite/Andesite) (Pumice (a highly vesicular volcanic glass/extrusive igneous rock)) — igneous

Pumice (Vesicular Rhyolite/Andesite)

Pumice (a highly vesicular volcanic glass/extrusive igneous rock)

Obsidian (Volcanic Glass (Amorphous Silicon Dioxide)) — igneous

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Obsidian (Carved) (Volcanic glass (high-silica amorphous glass, >70% SiO2)) — igneous

Obsidian (Carved)

Volcanic glass (high-silica amorphous glass, >70% SiO2)

Black Obsidian (Volcanic Glass (SiO2 + impurities)) — igneous

Black Obsidian

Volcanic Glass (SiO2 + impurities)