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 (SiO2 rich)) — Igneous

Obsidian

Volcanic Glass (SiO2 rich)

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

Obsidian

Obsidian (Volcanic Glass, SiO2)

Obsidian (Volcanic Glass (predominantly SiO2)) — igneous

Obsidian

Volcanic Glass (predominantly SiO2)

Obsidian (Volcanic Glass (Amorphous Silica)) — igneous

Obsidian

Volcanic Glass (Amorphous Silica)

Obsidian (Volcanic glass (SiO2-rich)) — igneous

Obsidian

Volcanic glass (SiO2-rich)

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

Obsidian

Volcanic Glass (SiO2 + impurities)

Pumice (Pumicite (Amorphous Volcanic Glass)) — igneous

Pumice

Pumicite (Amorphous Volcanic Glass)

Pumice (Pumice (Vesicular volcanic glass)) — igneous

Pumice

Pumice (Vesicular volcanic glass)

Pumice (Pumice (Vesicular volcanic glass)) — igneous

Pumice

Pumice (Vesicular volcanic glass)

Pumice (Pumice (Vesicular volcanic glass)) — igneous

Pumice

Pumice (Vesicular volcanic glass)

Obsidian (Volcanic Glass (SiO2 dominant)) — igneous

Obsidian

Volcanic Glass (SiO2 dominant)

Obsidian (Volcanic Glass (mostly SiO2)) — igneous

Obsidian

Volcanic Glass (mostly SiO2)

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

Obsidian

Obsidian (Volcanic Glass, SiO2)

Mahogany Obsidian (Volcanic glass (SiO2 + Fe2O3)) — igneous

Mahogany Obsidian

Volcanic glass (SiO2 + Fe2O3)

Obsidian (Volcanic Glass (Amorphous Silica)) — igneous

Obsidian

Volcanic Glass (Amorphous Silica)

Apache Tear (Hydrated Obsidians (Volcanic Glass)) — igneous

Apache Tear

Hydrated Obsidians (Volcanic Glass)

Obsidian (Volcanic Glass (predominantly SiO2)) — igneous

Obsidian

Volcanic Glass (predominantly SiO2)

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

Mahogany Obsidian

Volcanic Glass (SiO2 + Fe2O3)

Pumice (Pumice (Vesicular volcanic glass)) — igneous

Pumice

Pumice (Vesicular volcanic glass)

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

Pumice

Vesicular volcanic glass, typically rhyolitic to dacitic in composition

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

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Quartz (Milky/Clear) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Pumice (Volcanic Rock) (Vesicular volcanic rock (composed largely of amorphous volcanic glass)) — igneous

Pumice (Volcanic Rock)

Vesicular volcanic rock (composed largely of amorphous volcanic glass)

Obsidian (volcanic glass) (Obsidian, naturally occurring rhyolitic volcanic glass; composition is silica-rich, commonly about 70–75% SiO₂) — igneous

Obsidian (volcanic glass)

Obsidian, naturally occurring rhyolitic volcanic glass; composition is silica-rich, commonly about 70–75% SiO₂

Pumice (Pumice (Alveolar Rhyolite / Dacite / Andesite)) — igneous

Pumice

Pumice (Alveolar Rhyolite / Dacite / Andesite)

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

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions (SiO2)

Likely obsidian fragment (Volcanic glass; predominantly SiO₂ (amorphous, rhyolitic composition)) — igneous

Likely obsidian fragment

Volcanic glass; predominantly SiO₂ (amorphous, rhyolitic composition)

Vesicular volcanic rock (likely scoria) (Scoria, typically basaltic to andesitic volcanic rock) — igneous

Vesicular volcanic rock (likely scoria)

Scoria, typically basaltic to andesitic volcanic rock

Pumice (Pumice, vesicular volcanic glass (typically silica-rich rhyolitic composition)) — igneous

Pumice

Pumice, vesicular volcanic glass (typically silica-rich rhyolitic composition)

Pumice (Vesicular volcanic glass, chiefly silica-rich rhyolitic to dacitic composition) — igneous

Pumice

Vesicular volcanic glass, chiefly silica-rich rhyolitic to dacitic composition

Snowflake Obsidian (Obsidian with Cristobalite inclusions (70-75% SiO2)) — igneous

Snowflake Obsidian

Obsidian with Cristobalite inclusions (70-75% SiO2)

Red jasper or glassy volcanic rock (uncertain) (Likely hematite-rich jasper/chert; possibly obsidian with iron-oxide staining) — igneous

Red jasper or glassy volcanic rock (uncertain)

Likely hematite-rich jasper/chert; possibly obsidian with iron-oxide staining

Tumbled snowflake obsidian (Obsidian (volcanic glass), SiO₂, with cristobalite spherulites) — igneous

Tumbled snowflake obsidian

Obsidian (volcanic glass), SiO₂, with cristobalite spherulites

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

Pumice

Pumice (Vesicular Felsic Igneous Rock)

Obsidian (Obsidian (principally SiO2 - Silicon Dioxide)) — igneous

Obsidian

Obsidian (principally SiO2 - Silicon Dioxide)

Polished black stone, likely black obsidian (Obsidian, volcanic glass; primarily silica-rich SiO₂ with minor feldspar, iron, and magnesium) — igneous

Polished black stone, likely black obsidian

Obsidian, volcanic glass; primarily silica-rich SiO₂ with minor feldspar, iron, and magnesium

Snowflake obsidian (Volcanic glass (silica-rich rhyolitic composition), commonly with cristobalite inclusions) — igneous

Snowflake obsidian

Volcanic glass (silica-rich rhyolitic composition), commonly with cristobalite inclusions

Pumice (Pumice (highly vesicular volcanic glass; typically rhyolitic to dacitic composition)) — igneous

Pumice

Pumice (highly vesicular volcanic glass; typically rhyolitic to dacitic composition)

Polished Basalt (Basalt (Mafic volcanic rock)) — Igneous

Polished Basalt

Basalt (Mafic volcanic rock)

Snowflake Obsidian (Spherulitic Volcanic Glass (primarily SiO2)) — igneous

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2)

Basalt (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Snowflake Obsidian (Volcanic Glass with Spherulite Inclusions (70–75% SiO2)) — igneous

Snowflake Obsidian

Volcanic Glass with Spherulite Inclusions (70–75% SiO2)