Rock Identifier

Category

Igneous Rock

Browse igneous rock specimens identified by the Rock Identifier community.

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

Pumice

Pumice (a highly vesicular volcanic glass)

igneous
Yooperlite (Syenite clast containing fluorescent Sodalite) (Sodalite-bearing Syenite) — igneous

Yooperlite (Syenite clast containing fluorescent Sodalite)

Sodalite-bearing Syenite

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

Porphyritic Basalt (Flowerstone)

Porphyritic Basalt (Mafic volcanic rock)

igneous
Granite Gneiss (Gneiss (High-grade Metamorphic Rock)) — metamorphic

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

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

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

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

Milky Quartz

Silicon Dioxide (SiO2)

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

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

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

Vesicular Basalt

Vesicular Basalt (Aphanitic Mafic Rock)

igneous
Quartz (in a rock matrix) (Quartz (SiO2)) — mineral

Quartz (in a rock matrix)

Quartz (SiO2)

mineral
Schist (Chlorite or Mica-rich) (Chlorite Schist) — metamorphic

Schist (Chlorite or Mica-rich)

Chlorite Schist

metamorphic
Milky Quartz with Iron Inclusions (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

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

Basalt Pebble

Basalt (Aphanitic Mafic Volcanic Rock)

igneous
Granite (Granite) — igneous

Granite

Granite

igneous
Gneiss (High-grade Metamorphic Rock) (Gneiss (Metamorphic silicate rock)) — metamorphic

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic silicate rock)

metamorphic
River Stone (Basalt Porphyry) (Porphyritic Basalt) — igneous

River Stone (Basalt Porphyry)

Porphyritic Basalt

igneous
Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

metamorphic
Gneiss (Gneiss (High-grade metamorphic rock)) — metamorphic

Gneiss

Gneiss (High-grade metamorphic rock)

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

Clear Quartz

Silicon Dioxide (SiO2)

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

Milky Quartz/Clear Quartz Cluster

Silicon Dioxide (SiO2)

mineral
Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

mineral
Pumice (Pumice (a highly vesicular amorphous silicate glass)) — igneous

Pumice

Pumice (a highly vesicular amorphous silicate glass)

igneous
Coarse-grained Granite (Quartz and Feldspar dominated) (Granitoid (KAlSi3O8 – NaAlSi3O3 – CaAl2Si2O8 – SiO2)) — Igneous

Coarse-grained Granite (Quartz and Feldspar dominated)

Granitoid (KAlSi3O8 – NaAlSi3O3 – CaAl2Si2O8 – SiO2)

Igneous
Basalt with Epidote Veining (Basalt (Mafic Extrusive Rock) with Ca2(Al,Fe)3(SiO4)3(OH)) — igneous

Basalt with Epidote Veining

Basalt (Mafic Extrusive Rock) with Ca2(Al,Fe)3(SiO4)3(OH)

igneous
Basalt (Mafic volcanic rock, primarily composed of Plagioclase, Pyroxene, and Olivine) — Igneous

Basalt

Mafic volcanic rock, primarily composed of Plagioclase, Pyroxene, and Olivine

Igneous
Pumice (specifically a water-worn, weathered variety) (Vesicular volcanic glass) — igneous

Pumice (specifically a water-worn, weathered variety)

Vesicular volcanic glass

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

Pumice

Pumice (Vesicular Rhyolite/Andesite)

igneous
Andesite Porphyry (River Cobble) (Porphyritic Andesite) — igneous

Andesite Porphyry (River Cobble)

Porphyritic Andesite

igneous
Pumice (Pumice (Alveolar Rhyolite / Dacite / Andesite)) — igneous

Pumice

Pumice (Alveolar Rhyolite / Dacite / Andesite)

igneous
Pumice (Pumicite (Amorphous Volcanic Glass)) — igneous

Pumice

Pumicite (Amorphous Volcanic Glass)

igneous
Snowflake Obsidian (Vitreous volcanic silicate rock (SiO2) with Spherulite inclusions) — igneous

Snowflake Obsidian

Vitreous volcanic silicate rock (SiO2) with Spherulite inclusions

igneous
Basalt (Vesicular/Scoriaceous) (Extrusive Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)) — Igneous

Basalt (Vesicular/Scoriaceous)

Extrusive Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Igneous
Pumice (Pumicite (Amorphous Volcanic Glass)) — igneous

Pumice

Pumicite (Amorphous Volcanic Glass)

igneous
Basalt (Mafic volcanic rock (formula varies by mineral content: Ca-plagioclase, Pyroxene, Olivine)) — igneous

Basalt

Mafic volcanic rock (formula varies by mineral content: Ca-plagioclase, Pyroxene, Olivine)

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

Clear Quartz Cluster

Silicon Dioxide (SiO2)

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

Clear Quartz

Silicon Dioxide (SiO2)

mineral
Gneiss (with Quartzite and Mica) (Gneiss) — metamorphic

Gneiss (with Quartzite and Mica)

Gneiss

metamorphic
Basalt with Quartz Vein (Basalt (SiO2 vein inclusion)) — igneous

Basalt with Quartz Vein

Basalt (SiO2 vein inclusion)

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

Basalt

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

igneous
Pumice (Pumice (Vesicular Volcanic Glass)) — igneous

Pumice

Pumice (Vesicular Volcanic Glass)

igneous
Obsidian (Volcanic glass (SiO2 - Silicon Dioxide with impurities)) — igneous

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

igneous
Banded Gneiss (with Quartz Vein) (Gneiss (Metamorphic rock of varying mineralogy)) — metamorphic

Banded Gneiss (with Quartz Vein)

Gneiss (Metamorphic rock of varying mineralogy)

metamorphic
Quartz with Mica inclusions (likely Schist or Gneiss host) (Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)) — metamorphic

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

metamorphic