Rock Identifier

Category

Not A Rock

Browse not a rock specimens identified by the Rock Identifier community.

Learn about Not A Rock in the encyclopedia

Rock Gypsum

Rock Gypsum

Rock Salt

Rock Salt

Coral Rock

Coral Rock

Asphalt Rock

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Cataclasite

Cataclasite

Anorthosite

Anorthosite

Gondite

Gondite

Peridotite

Peridotite

Epidosite

Epidosite

Phosphorite

Phosphorite

Chert (Yellow Jasper/Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Banded Agate (Chalcedony (SiO2) with impurities) — mineral

Banded Agate

Chalcedony (SiO2) with impurities

Chert (specifically Jasper) (Silicon dioxide (SiO2) with iron oxide inclusions) — sedimentary

Chert (specifically Jasper)

Silicon dioxide (SiO2) with iron oxide inclusions

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Serpentine (variety: Serpentine Rock) (Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4) — metamorphic

Serpentine (variety: Serpentine Rock)

Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

Polished Black Basalt Pebble (Basalt) — igneous

Polished Black Basalt Pebble

Basalt

Basalt (with possible weathering) (Basalt) — igneous

Basalt (with possible weathering)

Basalt

Amphibolite (Amphibolite (rich in amphibole and plagioclase feldspar)) — metamorphic

Amphibolite

Amphibolite (rich in amphibole and plagioclase feldspar)

Granodiorite River Pebble (Granodiorite) — igneous

Granodiorite River Pebble

Granodiorite

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

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

Drupa or Druzy Quartz on Geode Fragment

Crystalline Silicon Dioxide (SiO2)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Basalt with Weathering Rind (Mafic Volcanic Rock (Primarily Plagioclase and Pyroxene)) — igneous

Basalt with Weathering Rind

Mafic Volcanic Rock (Primarily Plagioclase and Pyroxene)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Basalt (Mafic Igneous Rock (composed primarily of pyroxene and plagioclase)) — igneous

Basalt

Mafic Igneous Rock (composed primarily of pyroxene and plagioclase)

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

Basalt

Basalt (containing Pyroxene and Plagioclase Feldspar)

Quartzite (Quartzite (chiefly SiO2)) — metamorphic

Quartzite

Quartzite (chiefly SiO2)

Basalt (Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)) — Igneous

Basalt

Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)

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

Quartz (Milky/Clear Variety)

Silicon Dioxide (SiO2)

Chert / Jasper (Silicon Dioxide (SiO2)) — sedimentary

Chert / Jasper

Silicon Dioxide (SiO2)

Basalt (River Stone) (Basalt) — igneous

Basalt (River Stone)

Basalt

Eclogite (Eclogite (Omphacite + Pyrope)) — metamorphic

Eclogite

Eclogite (Omphacite + Pyrope)

Vesicular Basalt with Secondary Mineral Inclusions (Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Vesicular Basalt with Secondary Mineral Inclusions

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt (Basalt (Mafic Extrusive)) — igneous

Basalt

Basalt (Mafic Extrusive)

Basalt (River Pebble) (Basalt) — igneous

Basalt (River Pebble)

Basalt

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt) — igneous

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Basalt with Scoria/Vesicular Texture (Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)) — igneous

Basalt with Scoria/Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Basalt Pebble with Epidote/Olivine (Vitreous Basalt (SiO2 with Ca/Mg/Fe silicates)) — igneous

Basalt Pebble with Epidote/Olivine

Vitreous Basalt (SiO2 with Ca/Mg/Fe silicates)

Quartzite (River Stone) (Quartzite (predominantly SiO2)) — metamorphic

Quartzite (River Stone)

Quartzite (predominantly SiO2)

Sandstone (Ferruginous) (Arenite (complex silicate composition with iron oxides)) — sedimentary

Sandstone (Ferruginous)

Arenite (complex silicate composition with iron oxides)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Unakite (Unakite (Epidotized Granite)) — metamorphic

Unakite

Unakite (Epidotized Granite)

Granodiorite (Granodiorite (NaCa0.5(AlSi3O8)2(Fe,Mg)2)) — igneous

Granodiorite

Granodiorite (NaCa0.5(AlSi3O8)2(Fe,Mg)2)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Granite (Granite (compositionally: Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Granite (compositionally: Quartz, Alkali Feldspar, and Plagioclase)

Basalt (River Stone) (Afanitic Basalt (primarily Plagioclase Feldspar and Pyroxene)) — igneous

Basalt (River Stone)

Afanitic Basalt (primarily Plagioclase Feldspar and Pyroxene)

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

Basalt

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

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt