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

Rock Salt

Asphalt Rock

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 extrusive igneous rock)) — igneous

Pumice

Pumice (a highly vesicular extrusive igneous rock)

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

Snowflake Obsidian

Volcanic Glass (SiO2 with Cristobalite inclusions)

Obsidian (Volcanic Glass (Silica / SiO2)) — igneous

Obsidian

Volcanic Glass (Silica / SiO2)

Red Agate (Chalcedony (SiO2)) — gemstone

Red Agate

Chalcedony (SiO2)

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

Mahogany Obsidian

Obsidian (Volcanic Glass) with Hematite/Magnetite inclusions

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

Pumice

Pumice (Vesicular Rhyolite/Andesite)

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

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

Rhyolite

Rhyolite (High-silica volcanic rock)

Tumbled basalt (Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine and magnetite) — igneous

Tumbled basalt

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine and magnetite

Orbicular rhyolite (likely) (Rhyolite, a silica-rich volcanic rock; commonly quartz, alkali feldspar, plagioclase, and iron-rich alteration minerals) — igneous

Orbicular rhyolite (likely)

Rhyolite, a silica-rich volcanic rock; commonly quartz, alkali feldspar, plagioclase, and iron-rich alteration minerals

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)

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Snowflake Obsidian (Volcanic glass containing Spherulitic inclusions (SiO2 + impurities)) — igneous

Snowflake Obsidian

Volcanic glass containing Spherulitic inclusions (SiO2 + impurities)

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

Obsidian

Amorphous Volcanic Glass (primarily SiO2)

Pumice (Pumice (Amorphous volcanic glass)) — igneous

Pumice

Pumice (Amorphous volcanic glass)

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

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2)

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

Pumice

Pumice (Highly vesicular volcanic glass)

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

Pumice

Pumice (a highly vesicular volcanic glass)

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

Pumice

Pumice (Vesicular Rhyolite/Dacite)

Apache Tear (Obsidian (Hydrated Silica Glass)) — igneous

Apache Tear

Obsidian (Hydrated Silica Glass)

Milky Quartz with Chlorite/Mica inclusions (Silicon Dioxide (SiO2) with inclusions) — mineral

Milky Quartz with Chlorite/Mica inclusions

Silicon Dioxide (SiO2) with inclusions

Polished dark pebble, likely basalt or chert (Basalt (mafic volcanic rock), possibly microcrystalline chert) — igneous

Polished dark pebble, likely basalt or chert

Basalt (mafic volcanic rock), possibly microcrystalline chert

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)

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

Obsidian

Volcanic glass (Amorphous silicon dioxide)

Weathered basalt or volcanic rock (Likely vesicular basalt; composition dominated by plagioclase and pyroxene, with possible iron-oxide alteration) — igneous

Weathered basalt or volcanic rock

Likely vesicular basalt; composition dominated by plagioclase and pyroxene, with possible iron-oxide alteration

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

Pumice

Pumice (Vesicular Felsic Igneous Rock)

Vesicular basalt (likely scoriaceous basalt) (Mafic volcanic rock, chiefly plagioclase, pyroxene, and olivine; commonly iron-rich volcanic glass) — igneous

Vesicular basalt (likely scoriaceous basalt)

Mafic volcanic rock, chiefly plagioclase, pyroxene, and olivine; commonly iron-rich volcanic glass

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Pumice (Pumice (Silicic volcanic glass with vesicular structure)) — igneous

Pumice

Pumice (Silicic volcanic glass with vesicular structure)

Vesicular volcanic rock, likely pumice or scoriaceous basalt (Highly vesicular basaltic–andesitic volcanic rock; chiefly plagioclase, pyroxene, and volcanic glass) — igneous

Vesicular volcanic rock, likely pumice or scoriaceous basalt

Highly vesicular basaltic–andesitic volcanic rock; chiefly plagioclase, pyroxene, and volcanic glass

Vesicular volcanic rock, likely pumice or scoria (Pumice (highly vesicular rhyolitic–andesitic volcanic glass) or scoria (vesicular basaltic–andesitic rock)) — igneous

Vesicular volcanic rock, likely pumice or scoria

Pumice (highly vesicular rhyolitic–andesitic volcanic glass) or scoria (vesicular basaltic–andesitic rock)

Quartz Veined Diorite or Basalt (Crystalline Silicon Dioxide (Quartz) in Mafic Igneous Host (Basalt/Diorite)) — igneous

Quartz Veined Diorite or Basalt

Crystalline Silicon Dioxide (Quartz) in Mafic Igneous Host (Basalt/Diorite)

Polished black stone pendant, likely obsidian (Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), if obsidian) — igneous

Polished black stone pendant, likely obsidian

Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), if obsidian

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

Pumice

Vesicular volcanic glass (primarily SiO2)

Pumice (Vesicular Rhyolite (Amorphous glass)) — igneous

Pumice

Vesicular Rhyolite (Amorphous glass)

Rounded gray pebble, likely basalt or andesite (Fine-grained mafic to intermediate volcanic rock; commonly basalt (plagioclase ± pyroxene/olivine)) — igneous

Rounded gray pebble, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; commonly basalt (plagioclase ± pyroxene/olivine)

Pumice (Vesicular Felsic Extrusive Igneous Rock) — igneous

Pumice

Vesicular Felsic Extrusive Igneous Rock

Basalt (Basalt) — igneous

Basalt

Basalt

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

Pumice (Pumicite) — igneous

Pumice

Pumicite

Tumbled black stone, likely basalt or obsidian (Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or dark volcanic glass (obsidian)) — igneous

Tumbled black stone, likely basalt or obsidian

Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or dark volcanic glass (obsidian)