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

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

Pumice

Pumice (a highly vesicular volcanic rock)

Obsidian Arrowhead (Volcanic Glass (SiO2)) — igneous

Obsidian Arrowhead

Volcanic Glass (SiO2)

Obsidian (Volcanic Glass (SiO2)) — igneous

Obsidian

Volcanic Glass (SiO2)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Pumice (Pumice (Volcanic Rock)) — igneous

Pumice

Pumice (Volcanic Rock)

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

Pumice

Pumice (a highly vesicular, silicic volcanic rock)

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

Pumice

Pumice (a vesicular volcanic glass)

Pumice (Pumice (Amorphous volcanic glass)) — igneous

Pumice

Pumice (Amorphous volcanic glass)

Basalt (Basalt) — igneous

Basalt

Basalt

Pumice (Pumice (Vesicular Felsic to Intermediate Volcanic Rock)) — igneous

Pumice

Pumice (Vesicular Felsic to Intermediate Volcanic Rock)

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

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

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

Red Obsidian

Volcanic Glass (Amorphous SiO2)

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Quartz Druzy (Crystalline Silicon Dioxide (SiO2)) — mineral

Quartz Druzy

Crystalline Silicon Dioxide (SiO2)

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

Pumice

Pumice (Vesicular Rhyolite/Andesite)

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

Obsidian

Volcanic Glass (SiO2 + impurities)

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

Snowflake Obsidian

Volcanic Glass (SiO2) with Cristobalite inclusions

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)

Pumice (Pumicite) — igneous

Pumice

Pumicite

Obsidian with Cristobalite (Volcanic Glass (Amorphous Silicon Dioxide) with Cristobalite inclusions) — igneous

Obsidian with Cristobalite

Volcanic Glass (Amorphous Silicon Dioxide) with Cristobalite inclusions

Mahogany Obsidian (Volcanic Glass (SiO2 with iron and magnesium oxides)) — igneous

Mahogany Obsidian

Volcanic Glass (SiO2 with iron and magnesium oxides)

Rhyolite (Rhyolite (High-silica volcanic rock)) — igneous

Rhyolite

Rhyolite (High-silica volcanic rock)

Pumice (Volcanic glass / Pumice) — igneous

Pumice

Volcanic glass / Pumice

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

Snowflake Obsidian

Vitreous volcanic rock with Cristobalite inclusions (mostly SiO2)

Rhyolite or jasper-bearing volcanic rock (Rhyolite, likely altered and silicified; red coloration may come from hematite) — igneous

Rhyolite or jasper-bearing volcanic rock

Rhyolite, likely altered and silicified; red coloration may come from hematite

Pumice (Pumice (Glassy Volcanic Rock)) — igneous

Pumice

Pumice (Glassy Volcanic Rock)

Obsidian (Volcanic Glass (Amorphous SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous SiO2)

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

Pumice

Pumicite (Volcanic glass with vesicular texture)

Snowflake Obsidian (Spherulitic Volcanic Glass (SiO2 + impurities)) — igneous

Snowflake Obsidian

Spherulitic Volcanic Glass (SiO2 + impurities)

Wonderstone (Banded Rhyolite) (Rhyolite (Silicon Dioxide with Iron Oxide impurities)) — igneous

Wonderstone (Banded Rhyolite)

Rhyolite (Silicon Dioxide with Iron Oxide impurities)

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

Pumice

Pumice (a vesicular volcanic glass)

Pumice (Pumice (Vesicular volcanic glass)) — igneous

Pumice

Pumice (Vesicular volcanic glass)

Snowflake Obsidian (Obsidian with Spherulitic Cristobalite (SiO2)) — igneous

Snowflake Obsidian

Obsidian with Spherulitic Cristobalite (SiO2)

Black Obsidian (Volcanic Glass (Amorphous SiO2 with trace impurities)) — igneous

Black Obsidian

Volcanic Glass (Amorphous SiO2 with trace impurities)

Porphyritic Rhyolite (Red) (Rhyolite (Porphyry)) — igneous

Porphyritic Rhyolite (Red)

Rhyolite (Porphyry)

Rhyolite (Rhyolite (High-silica volcanic rock)) — igneous

Rhyolite

Rhyolite (High-silica volcanic rock)

Quartz in Host Rock (Silicon Dioxide (SiO2) in Rhyolite or Granite matrix) — igneous

Quartz in Host Rock

Silicon Dioxide (SiO2) in Rhyolite or Granite matrix

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

Snowflake Obsidian

Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions

Small vesicular volcanic rock, likely scoria (Scoria; predominantly basaltic to andesitic volcanic rock) — igneous

Small vesicular volcanic rock, likely scoria

Scoria; predominantly basaltic to andesitic volcanic rock

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

Pumice

Pumice (a highly vesicular volcanic glass)

Quartz-bearing volcanic rock, likely vesicular basalt (Basalt with secondary quartz (SiO₂) and possible zeolite/chalcedony infill) — igneous

Quartz-bearing volcanic rock, likely vesicular basalt

Basalt with secondary quartz (SiO₂) and possible zeolite/chalcedony infill