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

Quartz (Iron-stained or Rose variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained or Rose variant)

Silicon Dioxide (SiO2)

Jasper and Agate Mix (Silicon dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Jasper and Agate Mix

Silicon dioxide (SiO2) - Microcrystalline Quartz

Quartz geode (likely amethyst-bearing) (Silica geode; quartz, SiO₂, with possible amethyst and minor iron oxides) — mineral

Quartz geode (likely amethyst-bearing)

Silica geode; quartz, SiO₂, with possible amethyst and minor iron oxides

Porphyritic Basalt (Porphyritic Basalt (with Plagioclase and Augite phenocrysts)) — igneous

Porphyritic Basalt

Porphyritic Basalt (with Plagioclase and Augite phenocrysts)

Basalt (Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)) — igneous

Basalt

Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)

Peridotite (Peridotite (composed largely of olivine (Mg,Fe)2SiO4 and pyroxene)) — igneous

Peridotite

Peridotite (composed largely of olivine (Mg,Fe)2SiO4 and pyroxene)

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

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Quartz Mineral Specimens (Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz Mineral Specimens

Quartz (Silicon Dioxide, SiO2)

Yellow Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Basalt Porphyry (Porphyritic Basalt) — igneous

Basalt Porphyry

Porphyritic Basalt

Basalt with Quartz Veining (Basalt (SiO2-rich veins)) — igneous

Basalt with Quartz Veining

Basalt (SiO2-rich veins)

Amygdaloidal Basalt with Quartz Infill (Basalt (SiO2 for the quartz inclusion)) — igneous

Amygdaloidal Basalt with Quartz Infill

Basalt (SiO2 for the quartz inclusion)

Basalt with vesicles (Amygdaloidal Basalt) (Amygdaloidal Basalt (predominantly Plagioclase and Pyroxene)) — igneous

Basalt with vesicles (Amygdaloidal Basalt)

Amygdaloidal Basalt (predominantly Plagioclase and Pyroxene)

Quartz and Iron Oxide (Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions) — mineral

Quartz and Iron Oxide

Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

Quartz Druzy on Geode Fragment

Silicon Dioxide (SiO2)

Snowflake Obsidian (Spherulitic Obsidian (Volcanic glass containing Cristobalite)) — igneous

Snowflake Obsidian

Spherulitic Obsidian (Volcanic glass containing Cristobalite)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Basalt with Weathered Rind (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt with Weathered Rind

Basalt (Aphanitic Mafic Igneous Rock)

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

Basalt (Vesicular)

Basalt (Mafic Extrusive Igneous Rock)

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

Quartz Crystal (Geode Fragment)

Silicon Dioxide (SiO2)

Polished carnelian/chalcedony agate (Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide coloring) — mineral

Polished carnelian/chalcedony agate

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide coloring

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

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Yellow Quartz / Chalcedony Pebble (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz / Chalcedony Pebble

Silicon Dioxide (SiO2)

Scoria (Red Lava Rock) (Extrusive Vesicular Basalt / Andesite) — igneous

Scoria (Red Lava Rock)

Extrusive Vesicular Basalt / Andesite

Greenstone (Greenschist (Greened Metabasalt)) — metamorphic

Greenstone

Greenschist (Greened Metabasalt)

Obsidian (Obsidian (Volcanic Glass) SiO2 (70% or more)) — igneous

Obsidian

Obsidian (Volcanic Glass) SiO2 (70% or more)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Basalt (Basalt) — igneous

Basalt

Basalt

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-Stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Granite (Granite (Phaneritic Quartz-Feldspar Rock)) — igneous

Granite

Granite (Phaneritic Quartz-Feldspar Rock)

Diorite (Dalmatian Stone variant) (Phaneritic Intermediate Plutonic Rock (Diorite)) — igneous

Diorite (Dalmatian Stone variant)

Phaneritic Intermediate Plutonic Rock (Diorite)

Porphyritic Basalt (Amygdaloidal Porphyritic Basalt) — igneous

Porphyritic Basalt

Amygdaloidal Porphyritic Basalt

Snowflake Obsidian (Volcanic Glass with Spherulite inclusions (mainly Cristobalite)) — igneous

Snowflake Obsidian

Volcanic Glass with Spherulite inclusions (mainly Cristobalite)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Tumbled Obsidian (possibly Mahogany Obsidian variant) (Volcanic Glass (Amorphous Silicon Dioxide, SiO2)) — igneous

Tumbled Obsidian (possibly Mahogany Obsidian variant)

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Carnelian (Carnelian (Cryptocrystalline Quartz, SiO2)) — mineral

Carnelian

Carnelian (Cryptocrystalline Quartz, SiO2)

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

Milky Quartz/Clear Quartz Cluster

Silicon Dioxide (SiO2)