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 (Black Obsidian) (Obsidian (Volcanic Glass)) — igneous

Obsidian (Black Obsidian)

Obsidian (Volcanic Glass)

Obsidian (Volcanic Glass (SiO2)) — igneous

Obsidian

Volcanic Glass (SiO2)

Black Obsidian (Obsidian (Volcanic Glass)) — igneous

Black Obsidian

Obsidian (Volcanic Glass)

Black obsidian (probable) (Volcanic glass; predominantly SiO₂) — igneous

Black obsidian (probable)

Volcanic glass; predominantly SiO₂

Pumice (Volcanic glass / Pumiceous rock) — igneous

Pumice

Volcanic glass / Pumiceous rock

Pumice (Pumice (Vesicular volcanic glass)) — igneous

Pumice

Pumice (Vesicular volcanic glass)

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

Pumice

Pumice (a highly vesicular extrusive volcanic rock)

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

Black obsidian

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

Snowflake Obsidian (Obsidian with Cristobalite inclusions) — igneous

Snowflake Obsidian

Obsidian with Cristobalite inclusions

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

Pumice

Pumice (Vesicular Rhyolite/Andesite)

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

Snowflake Obsidian

Volcanic Glass (SiO2 + impurities)

Black tumbled stone, possibly obsidian (Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image) — igneous

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Pumice (Pumicite (Amorphous Volcanic Glass)) — Igneous

Pumice

Pumicite (Amorphous Volcanic Glass)

Pumice (Pumice (Amorphous volcanic glass)) — igneous

Pumice

Pumice (Amorphous volcanic glass)

Obsidian (likely black volcanic glass) (Obsidian; mostly amorphous SiO₂-rich rhyolitic glass) — igneous

Obsidian (likely black volcanic glass)

Obsidian; mostly amorphous SiO₂-rich rhyolitic glass

Pumice (Pumice) — igneous

Pumice

Pumice

Apache Tear (Obsidian (Natural volcanic glass)) — igneous

Apache Tear

Obsidian (Natural volcanic glass)

Obsidian (black volcanic glass) (Obsidian; primarily amorphous SiO₂-rich rhyolitic glass) — igneous

Obsidian (black volcanic glass)

Obsidian; primarily amorphous SiO₂-rich rhyolitic glass

Tumbled brown-and-black stone, likely mahogany obsidian (Volcanic glass; predominantly rhyolitic obsidian, SiO₂-rich) — igneous

Tumbled brown-and-black stone, likely mahogany obsidian

Volcanic glass; predominantly rhyolitic obsidian, SiO₂-rich

Basalt (Basalt (Aphanitic Igneous Rock)) — igneous

Basalt

Basalt (Aphanitic Igneous Rock)

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

Obsidian (black volcanic glass)

Obsidian; predominantly rhyolitic volcanic glass, chiefly SiO₂

Obsidian (volcanic glass), likely black obsidian (Rhyolitic volcanic glass; predominantly amorphous SiO₂) — igneous

Obsidian (volcanic glass), likely black obsidian

Rhyolitic volcanic glass; predominantly amorphous SiO₂

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

Obsidian with Mahogany Phasing

Volcanic Glass (SiO2 + Fe2O3)

Obsidian (Volcanic Glass (Amorphous SiO2-rich glass)) — Igneous

Obsidian

Volcanic Glass (Amorphous SiO2-rich glass)

Obsidian (likely black volcanic glass) (Obsidian; predominantly silica-rich rhyolitic volcanic glass (approximately 70– on 80% SiO₂)) — igneous

Obsidian (likely black volcanic glass)

Obsidian; predominantly silica-rich rhyolitic volcanic glass (approximately 70– on 80% SiO₂)

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

Pumice

Pumice (a vesicular volcanic glass)

Tumbled black obsidian (likely) (Volcanic glass; chiefly silica-rich rhyolitic glass (SiO₂)) — igneous

Tumbled black obsidian (likely)

Volcanic glass; chiefly silica-rich rhyolitic glass (SiO₂)

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

Pumice

Pumice (a highly vesicular extrusive volcanic glass)

Red Tuff / Sandstone (Rhyolitic Tuff / Pyroclastic Volcanic Rock) — igneous

Red Tuff / Sandstone

Rhyolitic Tuff / Pyroclastic Volcanic Rock

Snowflake Obsidian (Spherulitic Obsidian (Volcanic Glass with Cristobalite)) — igneous

Snowflake Obsidian

Spherulitic Obsidian (Volcanic Glass with Cristobalite)

Likely polished black stone, possibly obsidian (Obsidian (volcanic glass; primarily SiO₂), tentative identification) — igneous

Likely polished black stone, possibly obsidian

Obsidian (volcanic glass; primarily SiO₂), tentative identification

Rhyolitic Tuff (Rhyolitic Tuff / Pyroclastic rock) — igneous

Rhyolitic Tuff

Rhyolitic Tuff / Pyroclastic rock

Black Obsidian (Amorphous volcanic glass (SiO2 + impurities)) — igneous

Black Obsidian

Amorphous volcanic glass (SiO2 + impurities)

Obsidian (black volcanic glass) (Obsidian; predominantly rhyolitic volcanic glass, mainly SiO₂ with minor Al, K, Na, Fe, and Mg) — igneous

Obsidian (black volcanic glass)

Obsidian; predominantly rhyolitic volcanic glass, mainly SiO₂ with minor Al, K, Na, Fe, and Mg

Vesicular volcanic rock, likely pumice (Pumice (highly vesicular rhyolitic–dacitic volcanic glass; composition commonly rich in quartz and feldspar)) — igneous

Vesicular volcanic rock, likely pumice

Pumice (highly vesicular rhyolitic–dacitic volcanic glass; composition commonly rich in quartz and feldspar)

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

Pumice

Pumice (Vesicular Rhyolite/Andesite)

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

Black obsidian

Volcanic glass; chiefly rhyolitic silica glass (approximately 70–80% SiO₂)

Pumice (Vesicular volcanic glass, predominantly rhyolitic to dacitic composition) — igneous

Pumice

Vesicular volcanic glass, predominantly rhyolitic to dacitic composition

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

Obsidian

Volcanic Glass (SiO2 with impurities)

Obsidian (Volcanic Glass (Amorphous SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous SiO2)

Vesicular volcanic rock (likely pumice or scoria) (Vesicular volcanic rock; composition cannot be determined from the image, but likely pumice or scoria) — igneous

Vesicular volcanic rock (likely pumice or scoria)

Vesicular volcanic rock; composition cannot be determined from the image, but likely pumice or scoria

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

Snowflake Obsidian

Volcanic Glass (spherulitic obsidian)