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

Coral Rock

Rock Salt

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Cataclasite

Anorthosite

Peridotite

Gondite

Phosphorite

Epidosite

Basalt with Quartz Vein (Basaltic rock with hydrothermal SiO2 filling) — igneous

Basalt with Quartz Vein

Basaltic rock with hydrothermal SiO2 filling

Rounded gray river pebble, likely basalt or andesite (Fine-grained mafic volcanic rock; commonly basalt (plagioclase, pyroxene, and possible olivine)) — igneous

Rounded gray river pebble, likely basalt or andesite

Fine-grained mafic volcanic rock; commonly basalt (plagioclase, pyroxene, and possible olivine)

Garnet Schist (Mica Schist with Almandine (Fe3Al2(SiO4)3)) — metamorphic

Garnet Schist

Mica Schist with Almandine (Fe3Al2(SiO4)3)

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

Porphyritic Basalt

Porphyritic Basalt (with Plagioclase phenocrysts)

Porphyritic Basalt (with Pyrolusite or Iron-oxide staining) (Porphyritic Basalt (Mafic Extrusive)) — igneous

Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)

Porphyritic Basalt (Mafic Extrusive)

Pumice (Pumice (Amorphous volcanic glass)) — Igneous

Pumice

Pumice (Amorphous volcanic glass)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Serpentinite (Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)) — metamorphic

Serpentinite

Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)

River Stone (likely Basalt or Greywacke) (Basalt with mineral veining) — igneous

River Stone (likely Basalt or Greywacke)

Basalt with mineral veining

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Limestone (River Pebble) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (River Pebble)

Calcium Carbonate (CaCO3)

Fossils in Limestone (Crinoid / Marine Invertebrate Fossil) (Fossiliferous Limestone (containing Crinoidea / Brachiopoda)) — fossil

Fossils in Limestone (Crinoid / Marine Invertebrate Fossil)

Fossiliferous Limestone (containing Crinoidea / Brachiopoda)

Limestone (Weathered Pebble) (Calcium Carbonate (CaCO3) / Limestone) — sedimentary

Limestone (Weathered Pebble)

Calcium Carbonate (CaCO3) / Limestone

Quartz-Veined Sandstone (Quartz-veined Arenite) — sedimentary

Quartz-Veined Sandstone

Quartz-veined Arenite

Black beach pebble (likely basalt) (Basalt, a fine-grained volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine) — igneous

Black beach pebble (likely basalt)

Basalt, a fine-grained volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine

Granite (Granite) — igneous

Granite

Granite

Quartz-rich rock, likely granite or quartz-bearing metamorphic rock (Undetermined; possibly granitic rock composed mainly of quartz and feldspar, with mica or other dark minerals) — igneous

Quartz-rich rock, likely granite or quartz-bearing metamorphic rock

Undetermined; possibly granitic rock composed mainly of quartz and feldspar, with mica or other dark minerals

Agate Geode (Silicon Dioxide (SiO2)) — mineral

Agate Geode

Silicon Dioxide (SiO2)

Sandstone (lithic wacke) (Arenite / Lithic Wacke (mostly SiO2 with rock fragments)) — sedimentary

Sandstone (lithic wacke)

Arenite / Lithic Wacke (mostly SiO2 with rock fragments)

Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock with Arfvedsonite) — igneous

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Dalmatian Stone (Dalmatian Jasper (Aplite rock composition)) — igneous

Dalmatian Stone

Dalmatian Jasper (Aplite rock composition)

Sandstone (Wonderstone) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Wonderstone)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Shale (with Iron Staining) (Argillaceous mudstone / Shale) — sedimentary

Shale (with Iron Staining)

Argillaceous mudstone / Shale

Red Sandstone (Arenite (SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Arenite (SiO2 with Fe2O3)

Weathered sandstone (Quartz-rich sandstone, locally iron-oxide stained (SiO₂-dominant)) — sedimentary

Weathered sandstone

Quartz-rich sandstone, locally iron-oxide stained (SiO₂-dominant)

Lapis Lazuli (Lapis Lazuli (Complex rock primarily composed of Lazurite (Na,Ca)8[(SO4,S,Cl)2|(AlSiO4)6], Calcite, and Pyrite)) — metamorphic

Lapis Lazuli

Lapis Lazuli (Complex rock primarily composed of Lazurite (Na,Ca)8[(SO4,S,Cl)2|(AlSiO4)6], Calcite, and Pyrite)

Quartz-veined weathered host rock (Quartz (SiO₂) in a likely altered limestone or metamorphic carbonate host) — metamorphic

Quartz-veined weathered host rock

Quartz (SiO₂) in a likely altered limestone or metamorphic carbonate host

Weathered iron-rich rock, likely limonite/goethite-bearing laterite (Limonite–goethite aggregate, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)) — mineral

Weathered iron-rich rock, likely limonite/goethite-bearing laterite

Limonite–goethite aggregate, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)

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

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Asphalt (Bituminous Slate/Sandstone) (Asphaltum / Bituminous Rock) — sedimentary

Asphalt (Bituminous Slate/Sandstone)

Asphaltum / Bituminous Rock

Peach Moonstone (Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock

Iron-stained quartzite (likely) (Quartz-rich quartzite, predominantly SiO₂, with iron-oxide staining) — metamorphic

Iron-stained quartzite (likely)

Quartz-rich quartzite, predominantly SiO₂, with iron-oxide staining

Granodiorite or Diorite (Granodiorite / Diorite) — igneous

Granodiorite or Diorite

Granodiorite / Diorite

Likely basalt (possibly fine-grained gabbro) (Basalt; predominantly plagioclase feldspar, pyroxene, and commonly olivine) — igneous

Likely basalt (possibly fine-grained gabbro)

Basalt; predominantly plagioclase feldspar, pyroxene, and commonly olivine

Polished petrified wood (agate/chalcedony replacement) (Silicified wood, chiefly microcrystalline quartz (SiO₂), often with iron-oxide coloration) — fossil

Polished petrified wood (agate/chalcedony replacement)

Silicified wood, chiefly microcrystalline quartz (SiO₂), often with iron-oxide coloration

Dark gray fine-grained stone, likely basalt (Basalt; mainly plagioclase feldspar, pyroxene, and sometimes olivine) — igneous

Dark gray fine-grained stone, likely basalt

Basalt; mainly plagioclase feldspar, pyroxene, and sometimes olivine

Serpentine (Antigorite/Chrysotile group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4)) — metamorphic

Serpentine

Antigorite/Chrysotile group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4)

Basalt (Afanitic Mafic Basalt) — igneous

Basalt

Afanitic Mafic Basalt

Basalt (Mafic volcanic rock (primarily plagioclase, pyroxene, and olivine)) — Igneous

Basalt

Mafic volcanic rock (primarily plagioclase, pyroxene, and olivine)

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt) — igneous

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt