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

Quartz Crystal (Geode Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal (Geode Fragment)

Silicon Dioxide (SiO2)

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

Apache Tear (Obsidian)

Volcanic Glass (Amorphous Silicon Dioxide)

Obsidian (Volcanic Glass (70% or more SiO2)) — igneous

Obsidian

Volcanic Glass (70% or more SiO2)

Mahogany Obsidian (Volcanic Glass with Hematite inclusions (SiO2)) — igneous

Mahogany Obsidian

Volcanic Glass with Hematite inclusions (SiO2)

Obsidian (Obsidian (Volcanic Glass, SiO2 dominated)) — igneous

Obsidian

Obsidian (Volcanic Glass, SiO2 dominated)

Likely obsidian fragment (Volcanic glass, predominantly rhyolitic composition (SiO₂-rich)) — igneous

Likely obsidian fragment

Volcanic glass, predominantly rhyolitic composition (SiO₂-rich)

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

Black Obsidian (Faceted)

Volcanic Glass (Amorphous Silicon Dioxide)

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

Obsidian

Amorphous volcanic glass (principally SiO2)

Pumice (Pumice (Highly vesicular felsic extrusive igneous rock; primarily SiO2)) — igneous

Pumice

Pumice (Highly vesicular felsic extrusive igneous rock; primarily SiO2)

Vesicular volcanic pebble, likely pumice or vesicular andesite (Pumice (volcanic glass) or vesicular andesite; exact identification requires examination) — igneous

Vesicular volcanic pebble, likely pumice or vesicular andesite

Pumice (volcanic glass) or vesicular andesite; exact identification requires examination

Obsidian (Amorphous volcanic glass (70-75% SiO2)) — igneous

Obsidian

Amorphous volcanic glass (70-75% SiO2)

Snowflake Obsidian (Volcanic Glass with Spherulite inclusions (mainly Cristobalite)) — igneous

Snowflake Obsidian

Volcanic Glass with Spherulite inclusions (mainly Cristobalite)

Black tumbled stone, likely obsidian (Volcanic glass; chiefly amorphous SiO₂) — igneous

Black tumbled stone, likely obsidian

Volcanic glass; chiefly amorphous SiO₂

Polished black star-shaped stone, likely black obsidian (Obsidian (volcanic glass), primarily SiO₂) — igneous

Polished black star-shaped stone, likely black obsidian

Obsidian (volcanic glass), primarily SiO₂

Black tumbled stone, possibly obsidian (Volcanic glass; primarily SiO₂, if obsidian) — igneous

Black tumbled stone, possibly obsidian

Volcanic glass; primarily SiO₂, if obsidian

Polished black stone, likely black obsidian (Obsidian — volcanic glass, chiefly SiO₂) — igneous

Polished black stone, likely black obsidian

Obsidian — volcanic glass, chiefly SiO₂

Black tumbled stone, likely obsidian (Volcanic glass (obsidian), primarily SiO₂) — igneous

Black tumbled stone, likely obsidian

Volcanic glass (obsidian), primarily SiO₂

Mahogany Obsidian (Volcanic Glass (High-silica Rhyolite)) — igneous

Mahogany Obsidian

Volcanic Glass (High-silica Rhyolite)

Obsidian Arrowhead (Obsidian (volcanic glass, SiO2 rich)) — igneous

Obsidian Arrowhead

Obsidian (volcanic glass, SiO2 rich)

Obsidian (Apache Tear) (Volcanic Glass (High-silica Rhyolite)) — igneous

Obsidian (Apache Tear)

Volcanic Glass (High-silica Rhyolite)

Black Obsidian (Volcanic Glass (SiO2 + MgO / Fe3O4)) — igneous

Black Obsidian

Volcanic Glass (SiO2 + MgO / Fe3O4)

Mahogany Obsidian (Obsidian (Volcanic Glass with Hematite inclusions)) — igneous

Mahogany Obsidian

Obsidian (Volcanic Glass with Hematite inclusions)

Black Obsidian (Extrusive Volcanic Glass (primarily SiO2)) — igneous

Black Obsidian

Extrusive Volcanic Glass (primarily SiO2)

Mahogany Obsidian (Volcanic glass (SiO2 with Fe2O3 inclusions)) — igneous

Mahogany Obsidian

Volcanic glass (SiO2 with Fe2O3 inclusions)

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

Obsidian (Polished)

Obsidian (Volcanic glass, primarily SiO2)

Obsidian (Volcanic glass (Amorphous silicon dioxide)) — igneous

Obsidian

Volcanic glass (Amorphous silicon dioxide)

Black Obsidian (Volcanic Glass (Silicon Dioxide with impurities)) — igneous

Black Obsidian

Volcanic Glass (Silicon Dioxide with impurities)

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

Pumice

Pumice (a highly vesicular volcanic glass)

Obsidian (Volcanic Glass (70-75% SiO2)) — igneous

Obsidian

Volcanic Glass (70-75% SiO2)

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

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Pumice (Pumice (volcanic glass with vesicular texture)) — igneous

Pumice

Pumice (volcanic glass with vesicular texture)

Pumice (Pumice (Volcanic glass with vesicular texture)) — igneous

Pumice

Pumice (Volcanic glass with vesicular texture)

Apache Tear (Obsidian) (Volcanic glass (SiO2 - Silicon Dioxide)) — igneous

Apache Tear (Obsidian)

Volcanic glass (SiO2 - Silicon Dioxide)

Obsidian (Volcanic Glass (70% or more SiO2)) — igneous

Obsidian

Volcanic Glass (70% or more SiO2)

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

Black Obsidian

Obsidian (Amorphous volcanic glass, SiO2)

Pumice (Pumice (volcanic glass with vesicular texture)) — igneous

Pumice

Pumice (volcanic glass with vesicular texture)

Apache Tear (Obsidian) (Volcanic glass (SiO2 - Silicon Dioxide)) — igneous

Apache Tear (Obsidian)

Volcanic glass (SiO2 - Silicon Dioxide)

Pumice (Pumice (Highly vesicular volcanic glass)) — igneous

Pumice

Pumice (Highly vesicular volcanic glass)

Obsidian (Volcanic glass (mainly SiO2 with inclusions)) — igneous

Obsidian

Volcanic glass (mainly SiO2 with inclusions)

Obsidian (Volcanic Glass (70-75% SiO2)) — igneous

Obsidian

Volcanic Glass (70-75% SiO2)

Obsidian (Volcanic Glass (Silicon Dioxide with impurities)) — igneous

Obsidian

Volcanic Glass (Silicon Dioxide with impurities)

Obsidian (Obsidian (Volcanic Glass, complex silicate)) — igneous

Obsidian

Obsidian (Volcanic Glass, complex silicate)