Rock Identifier

Category

Igneous Rock (Volcanic Glass)

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

Pumice (Pumiceous rhyolite / Volcanic glass) — igneous

Pumice

Pumiceous rhyolite / Volcanic glass

Scoria (Extrusive Basaltic Scoria) — igneous

Scoria

Extrusive Basaltic Scoria

Pumice (Vesicular Rhyolite or Dacite Pumice (Amorphous volcanic glass)) — igneous

Pumice

Vesicular Rhyolite or Dacite Pumice (Amorphous volcanic glass)

Basalt (Basalt) — igneous

Basalt

Basalt

Obsidian (Obsidian (volcanic glass)) — Igneous

Obsidian

Obsidian (volcanic glass)

Pumice (Pumice (Vesicular Volcanic Glass)) — igneous

Pumice

Pumice (Vesicular Volcanic Glass)

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

Pumice

Pumice (a highly vesicular volcanic glass)

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

Obsidian (Black Obsidian)

Amorphous volcanic glass (primarily SiO2)

Olivine in Basalt (Peridot) (Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt) — igneous

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt

Obsidian (Volcanic Glass (Amorphous Silica)) — igneous

Obsidian

Volcanic Glass (Amorphous Silica)

Obsidian (Volcanic Glass (predominantly SiO2)) — igneous

Obsidian

Volcanic Glass (predominantly SiO2)

Basalt with vesicles/amygdules (Basalt (containing volcanic glass and plagioclase)) — igneous

Basalt with vesicles/amygdules

Basalt (containing volcanic glass and plagioclase)

Amethyst (Rough) (Silicon Dioxide with iron impurities (SiO2)) — mineral

Amethyst (Rough)

Silicon Dioxide with iron impurities (SiO2)

Pumice (Pumicite (Amorphous Volcanic Glass)) — igneous

Pumice

Pumicite (Amorphous Volcanic Glass)

Pumice (Pumicite (Amorphous Volcanic Glass)) — igneous

Pumice

Pumicite (Amorphous Volcanic Glass)

Obsidian (Volcanic glass (mainly SiO2)) — Igneous

Obsidian

Volcanic glass (mainly SiO2)

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

Pumice

Pumice (Vesicular Rhyolite/Andesite)

Snowflake Obsidian (Volcanic glass containing Spherulites (SiO2)) — igneous

Snowflake Obsidian

Volcanic glass containing Spherulites (SiO2)

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

Pumice

Vesicular volcanic glass (primarily SiO2)

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

Obsidian

Amorphous Volcanic Glass (primarily SiO2)

Amethyst (Amethyst (Silicon Dioxide - SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide - SiO2)

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

Pumice

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

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

Pumice

Pumice (a highly vesicular felsic volcanic rock)

Snowflake Obsidian (or similar porphyritic volcanic rock) (Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)) — igneous

Snowflake Obsidian (or similar porphyritic volcanic rock)

Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)

Rhyolitic Tuff (Breccia Type) (Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)) — igneous

Rhyolitic Tuff (Breccia Type)

Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)

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

Pumice

Vesicular volcanic glass (primarily SiO2)

Mahogany Obsidian (Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)) — igneous

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)

Pumice (Pumice (volcanic glass formed of highly vesicular rough textured rock)) — igneous

Pumice

Pumice (volcanic glass formed of highly vesicular rough textured rock)

Black Obsidian (Obsidian (Volcanic glass), 70–75% SiO2) — igneous

Black Obsidian

Obsidian (Volcanic glass), 70–75% SiO2

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

Scoria (Lava Rock)

Vesicular Basalt / Scoria

Obsidian (Volcanic Glass (Amorphous Silicon Dioxide, SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Snowflake Obsidian (Volcanic glass containing Cristobalite (SiO2)) — igneous

Snowflake Obsidian

Volcanic glass containing Cristobalite (SiO2)

Pumice (Vesicular volcanic glass (primarily Alumino-silicates)) — igneous

Pumice

Vesicular volcanic glass (primarily Alumino-silicates)

Pumice (Pumice (a highly vesicular extrusive igneous rock)) — Igneous

Pumice

Pumice (a highly vesicular extrusive igneous rock)

Pumice (Vesicular Rhyolite or Andesite (Amorphous volcanic glass)) — igneous

Pumice

Vesicular Rhyolite or Andesite (Amorphous volcanic glass)

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

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)

Agate (Moss or Plume Agate variety) (Silicon Dioxide (SiO2)) — mineral

Agate (Moss or Plume Agate variety)

Silicon Dioxide (SiO2)

Black Obsidian (Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)) — igneous

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

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

Pumice

Pumice (a highly vesicular amorphous volcanic glass)

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

Pumice

Pumice (a highly vesicular volcanic glass)

Basalt with Quartz/Calcite Veins (Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)) — igneous

Basalt with Quartz/Calcite Veins

Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)

Obsidian (Volcanic Glass (Extrusive Igneous Rock, primarily SiO2)) — igneous

Obsidian

Volcanic Glass (Extrusive Igneous Rock, primarily SiO2)