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

Granite Pebble (Granite (Phaneritic Igneous Rock)) — igneous

Granite Pebble

Granite (Phaneritic Igneous Rock)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

Snowflake Obsidian

Volcanic Glass with Spherulite inclusions (SiO2)

Faceted Clear Quartz (Crystalline Silicon Dioxide (SiO2)) — mineral

Faceted Clear Quartz

Crystalline Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Sunstone (Oligoclase or Andesine (Labradorite) Feldspar (Na,Ca)(Si,Al)4O8) — mineral

Sunstone

Oligoclase or Andesine (Labradorite) Feldspar (Na,Ca)(Si,Al)4O8

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

White Agate (Chalcedony)

Silicon Dioxide (SiO2)

Milk Quartz (White) and Yellow Aventurine (Yellow) (Silicon Dioxide (SiO2)) — mineral

Milk Quartz (White) and Yellow Aventurine (Yellow)

Silicon Dioxide (SiO2)

Black Onyx (Silicon Dioxide (SiO2) with parallel banding) — mineral

Black Onyx

Silicon Dioxide (SiO2) with parallel banding

Tree Agate (Dendritic Agate/Quartz) (Silicon Dioxide (SiO2) with trace Manganese or Iron oxide inclusions) — mineral

Tree Agate (Dendritic Agate/Quartz)

Silicon Dioxide (SiO2) with trace Manganese or Iron oxide inclusions

Pumice (Vesicular Lava) (Pumice) — igneous

Pumice (Vesicular Lava)

Pumice

Obsidian (Volcanic glass (high silica SiO2)) — igneous

Obsidian

Volcanic glass (high silica SiO2)

Greenstone (or River-tumbled Basalt / Greywacke with Epidote) (Metabasalt / Greenschist facies rock) — metamorphic

Greenstone (or River-tumbled Basalt / Greywacke with Epidote)

Metabasalt / Greenschist facies rock

Porphyritic Basalt (Porphyritic Basalt (containing Plagioclase phenocrysts)) — igneous

Porphyritic Basalt

Porphyritic Basalt (containing Plagioclase phenocrysts)

Basalt (Mafic Volcanic Rock (composed of Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Mafic Volcanic Rock (composed of Plagioclase Feldspar and Pyroxene)

Veined Basalt River Stone (Basalt with Calcite or Quartz veining) — igneous

Veined Basalt River Stone

Basalt with Calcite or Quartz veining

Basalt (Basalt (composition mainly of Plagioclase feldspar, Pyroxene, and Olivine)) — igneous

Basalt

Basalt (composition mainly of Plagioclase feldspar, Pyroxene, and Olivine)

Amygdaloidal Basalt (Amygdaloidal Basalt) — Igneous

Amygdaloidal Basalt

Amygdaloidal Basalt

Basalt (Basalt) — igneous

Basalt

Basalt

Basalt with Vesicular Surface (Basalt (Mafic Extrusive)) — igneous

Basalt with Vesicular Surface

Basalt (Mafic Extrusive)

Snowflake Obsidian (Volcanic glass containing Spherulites (SiO2)) — igneous

Snowflake Obsidian

Volcanic glass containing Spherulites (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

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

Agate (Chalcedony)

Silicon Dioxide (SiO2)

Mahogany Obsidian (Volcanic Glass (predominantly SiO2 with Hematite/Magnetite inclusions)) — igneous

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with Hematite/Magnetite inclusions)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Black Obsidian (Obsidian (Volcanic Glass, rich in SiO2)) — igneous

Black Obsidian

Obsidian (Volcanic Glass, rich in SiO2)

Granodiorite (Granodiorite) — igneous

Granodiorite

Granodiorite

Diorite (Phaneritic Intermediate Plutonic Rock) — igneous

Diorite

Phaneritic Intermediate Plutonic Rock

Diorite river pebble (Diorite (intermediate plutonic rock)) — igneous

Diorite river pebble

Diorite (intermediate plutonic rock)

Peridotite (Ultramafic intrusive rock (Peridotite)) — Igneous

Peridotite

Ultramafic intrusive rock (Peridotite)

Aventurine (Green Quartz) (Silicon dioxide with inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)) — mineral

Aventurine (Green Quartz)

Silicon dioxide with inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Basalt (Mafic volcanic rock (Primary minerals: Plagioclase feldspar, Pyroxene)) — igneous

Basalt

Mafic volcanic rock (Primary minerals: Plagioclase feldspar, Pyroxene)

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

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Yellow Jasper / Chalcedony (Silicon Dioxide (SiO2) with iron inclusions) — mineral

Yellow Jasper / Chalcedony

Silicon Dioxide (SiO2) with iron inclusions

Diabase (Greenstone) (Diabase (also known as Dolerite)) — igneous

Diabase (Greenstone)

Diabase (also known as Dolerite)

Basalt (Basalt) — igneous

Basalt

Basalt

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

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Scoria (Red Lava Rock) (Scoria (Vesicular basaltic rock)) — Igneous

Scoria (Red Lava Rock)

Scoria (Vesicular basaltic rock)

Granodiorite (Granodiorite (Intermediate intrusive igneous rock)) — igneous

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Obsidian (Amorphous volcanic glass (70-75% SiO2)) — igneous

Obsidian

Amorphous volcanic glass (70-75% SiO2)

Basalt with Fusion Crust (Meteorite-like appearance) (Vesicular Basalt) — igneous

Basalt with Fusion Crust (Meteorite-like appearance)

Vesicular Basalt