Rock Identifier

Category

Igneous

Browse igneous specimens identified by the Rock Identifier community.

Obsidian (Black Obsidian) (Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)) — igneous

Obsidian (Black Obsidian)

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Diorite (Phaneritic intermediate plutonic rock) — igneous

Diorite

Phaneritic intermediate plutonic rock

Granite porphyry (Porphyritic Granite) — igneous

Granite porphyry

Porphyritic Granite

Obsidian (Volcanic glass (Mainly SiO2)) — igneous

Obsidian

Volcanic glass (Mainly SiO2)

Granite (Phaneritic plutonic rock (composed of quartz, alkali feldspar, and plagioclase)) — igneous

Granite

Phaneritic plutonic rock (composed of quartz, alkali feldspar, and plagioclase)

Basalt with Scoria/Vesicular Texture (Vesicular Basalt (Iron-rich/Oxidized)) — igneous

Basalt with Scoria/Vesicular Texture

Vesicular Basalt (Iron-rich/Oxidized)

BROWN GRANITE (likely 'Tan Brown' or similar) (Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)) — igneous

BROWN GRANITE (likely 'Tan Brown' or similar)

Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)

Yooperlite (Sodalite-bearing Syenite) (Sodalite-rich Syenite (Na8(Al6Si6O24)Cl2)) — igneous

Yooperlite (Sodalite-bearing Syenite)

Sodalite-rich Syenite (Na8(Al6Si6O24)Cl2)

Limonitic Scoria (Vesicular Basalt with Iron Staining) (Highly vesicular basalt heavily stained by Limonite [FeO(OH)·nH2O]) — igneous

Limonitic Scoria (Vesicular Basalt with Iron Staining)

Highly vesicular basalt heavily stained by Limonite [FeO(OH)·nH2O]

Scoria (Scoria (a vesicular basalt or andesite)) — igneous

Scoria

Scoria (a vesicular basalt or andesite)

Basalt (Basalt) — igneous

Basalt

Basalt

Pink Granite (Granite (Felsic Plutonic Rock)) — igneous

Pink Granite

Granite (Felsic Plutonic Rock)

Basalt (Basalt (composition: Plagioclase, Pyroxene, and Olivine)) — igneous

Basalt

Basalt (composition: Plagioclase, Pyroxene, and Olivine)

Basalt (River Pebble) (Basalt) — igneous

Basalt (River Pebble)

Basalt

Amygdaloidal Basalt (Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)

Gabbro (Water-Worn Cobble) (Gabbro) — igneous

Gabbro (Water-Worn Cobble)

Gabbro

Vesicular Basalt (Iron-Stained) (Mafic Volcanic Rock (Basalt)) — igneous

Vesicular Basalt (Iron-Stained)

Mafic Volcanic Rock (Basalt)

Pink Granite (Phaneritic Plutonic Rock (Granite with K-Feldspar)) — igneous

Pink Granite

Phaneritic Plutonic Rock (Granite with K-Feldspar)

Granite (Granite) — igneous

Granite

Granite

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Granodiorite (Riverbed Cobble) (Granodiorite) — igneous

Granodiorite (Riverbed Cobble)

Granodiorite

Granite (Phaneritic plutonic rock (dominated by SiO2, Al2O3, K2O, Na2O)) — igneous

Granite

Phaneritic plutonic rock (dominated by SiO2, Al2O3, K2O, Na2O)

Pumice (Pumice (Vesicular volcanic glass)) — igneous

Pumice

Pumice (Vesicular volcanic glass)

Basalt (Drill Core) (Mafic Volcanic Rock (Basalt)) — igneous

Basalt (Drill Core)

Mafic Volcanic Rock (Basalt)

Granite (Phaneritic Plutonic Felsic Rock (Granite)) — igneous

Granite

Phaneritic Plutonic Felsic Rock (Granite)

Larvikite (Monzonite (intermediate intrusive igneous rock containing plagioclase, alkali feldspar, and minor dark minerals)) — igneous

Larvikite

Monzonite (intermediate intrusive igneous rock containing plagioclase, alkali feldspar, and minor dark minerals)

Black River Stone (likely Basalt or Chert) (Basalt (primarily Plagioclase Feldspar and Pyroxene)) — igneous

Black River Stone (likely Basalt or Chert)

Basalt (primarily Plagioclase Feldspar and Pyroxene)

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

Red Scoria (Lava Rock)

Scoria (Vesicular Basalt/Andesite)

Granodiorite (Granodiorite (Intermediate plutonic rock)) — igneous

Granodiorite

Granodiorite (Intermediate plutonic rock)

Basalt Porphyry (Porphyritic Basalt) — igneous

Basalt Porphyry

Porphyritic Basalt

Pumice (Vesicular volcanic glass) — igneous

Pumice

Vesicular volcanic glass

Obsidian (Vitreous volcanic silicate (70-75% SiO2)) — igneous

Obsidian

Vitreous volcanic silicate (70-75% SiO2)

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

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Apache Tear (Obsidian) (Hydrated volcanic glass (SiO2 with inclusions)) — igneous

Apache Tear (Obsidian)

Hydrated volcanic glass (SiO2 with inclusions)

Obsidian (Volcanic Glass (SiO2, usually >70% silica content)) — Igneous

Obsidian

Volcanic Glass (SiO2, usually >70% silica content)

Sapphire (Corundum variety) (Sapphire (Al₂O₃)) — Mineral

Sapphire (Corundum variety)

Sapphire (Al₂O₃)

Basalt (Basalt) — Igneous

Basalt

Basalt

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

Granite

Phaneritic Felsic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

Basalt (Weathered Pebble) (Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene) — igneous

Basalt (Weathered Pebble)

Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene

Granite (Phaneritic Plutonic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Phaneritic Plutonic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Granite (Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)

Granite (Plutonic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Plutonic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)