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

Basalt River Pebble (Basalt (Mafic Extrusive Volcanic Rock)) — igneous

Basalt River Pebble

Basalt (Mafic Extrusive Volcanic Rock)

Basalt Pebble (Basalt (Aphanitic Mafic Volcanic Rock)) — igneous

Basalt Pebble

Basalt (Aphanitic Mafic Volcanic Rock)

Basalt Arrowhead (worked stone) (Aphanitic mafic volcanic rock (Basalt)) — igneous

Basalt Arrowhead (worked stone)

Aphanitic mafic volcanic rock (Basalt)

Basalt (Porphyritic Basalt) (Porphyritic Basalt (Mafic volcanic rock)) — igneous

Basalt (Porphyritic Basalt)

Porphyritic Basalt (Mafic volcanic rock)

Basalt River Cobble (Basalt (Aphanitic Mafic Volcanic Rock)) — igneous

Basalt River Cobble

Basalt (Aphanitic Mafic Volcanic Rock)

Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic volcanic rock)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Andesite (Andesite (Intermediate Extrusive Volcanic Rock)) — igneous

Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

Andesite (Andesite (Intermediate Extrusive Volcanic Rock)) — igneous

Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic Volcanic Rock)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Agate (Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Agate (Chalcedony)

Silicon Dioxide (SiO2)

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Quartz / Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz / Rose Quartz

Silicon Dioxide (SiO2)

Faceted Clear Quartz or Diamond Simulant (Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic) — gemstone

Faceted Clear Quartz or Diamond Simulant

Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic

Granite (Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Pumice (Pumice) — igneous

Pumice

Pumice

Greenstone / Greenschist (Greenschist (composed of chlorite, epidote, and actinolite)) — metamorphic

Greenstone / Greenschist

Greenschist (composed of chlorite, epidote, and actinolite)

Mahogany Obsidian (Volcanic glass (high silica) with inclusions of Magnetite or Hematite) — igneous

Mahogany Obsidian

Volcanic glass (high silica) with inclusions of Magnetite or Hematite

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Basalt (Basalt (principally Plagioclase and Pyroxene)) — igneous

Basalt

Basalt (principally Plagioclase and Pyroxene)

Basalt (Basalt) — igneous

Basalt

Basalt

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

Pumice

Pumice (Vesicular Rhyolite/Andesite)

Scoria (Vesicular Basalt / Scoria) — igneous

Scoria

Vesicular Basalt / Scoria

Basalt (Basalt (composition primarily Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Basalt (composition primarily Plagioclase Feldspar and Pyroxene)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

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

Basalt River Rock

Basalt (Aphanitic Mafic Igneous Rock)

Scoria (Vesicular Basalt) (Scoria (Extrusive Mafic Igneous Rock)) — igneous

Scoria (Vesicular Basalt)

Scoria (Extrusive Mafic Igneous Rock)

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

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

Snowflake Obsidian

Spherulitic Obsidian (Volcanic Glass with Cristobalite inclusions)

Basalt (Basalt) — igneous

Basalt

Basalt

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

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Amethyst Quartz (Amethyst (Silicon Dioxide, SiO2)) — mineral

Amethyst Quartz

Amethyst (Silicon Dioxide, SiO2)

Porphyritic Rhyolite or Andesite (Porphyry) (Porphyritic igneous rock (Composition depends on exact mineralogy, often Rhyolite or Andesite)) — igneous

Porphyritic Rhyolite or Andesite (Porphyry)

Porphyritic igneous rock (Composition depends on exact mineralogy, often Rhyolite or Andesite)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (specifically Clear Quartz or Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Quartz pebble (Agate / Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Quartz pebble (Agate / Chalcedony)

Silicon Dioxide (SiO2)

Basalt (Basalt (principally Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Basalt (principally Plagioclase Feldspar and Pyroxene)

Quartz Geode or Druzy Quartz on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Geode or Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

Amygdaloidal Basalt (Amygdaloidal Basalt (extrusive volcanic rock with secondary mineral infilling)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with secondary mineral infilling)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Chalcedony (Agate / Chert) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate / Chert)

Silicon Dioxide (SiO2)

Smoky Quartz with Chert (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz with Chert

Silicon Dioxide (SiO2)