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

Limonite (after Pyrite Pseudomorph) (Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)) — mineral

Limonite (after Pyrite Pseudomorph)

Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)

Petrified Wood (Silicified wood (primarily quartz, SiO2)) — fossil

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Pumice (Pumice (Volcanic Rock)) — igneous

Pumice

Pumice (Volcanic Rock)

Garnet Gneiss (Garnetiferous Gneiss) — metamorphic

Garnet Gneiss

Garnetiferous Gneiss

Greywacke (likely) (Greywacke (a type of sandstone)) — Sedimentary

Greywacke (likely)

Greywacke (a type of sandstone)

Agate Geode (Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety) — Mineral

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety

Agate Geode with Quartz Druzy (Chalcedony (SiO2) and Quartz (SiO2)) — mineral

Agate Geode with Quartz Druzy

Chalcedony (SiO2) and Quartz (SiO2)

Unakite (Epidote-Feldspar rock) — Metamorphic Rock

Unakite

Epidote-Feldspar rock

Metamorphic Rock

Eroded volcanic rock formation (likely basalt) (Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, with possible olivine) — igneous

Eroded volcanic rock formation (likely basalt)

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

River Stone (Sandstone with Oxide Banding) (Arenite with Iron/Manganese Oxide inclusions) — sedimentary

River Stone (Sandstone with Oxide Banding)

Arenite with Iron/Manganese Oxide inclusions

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

Quartz (Milky Quartz vein fragment)

Silicon Dioxide (SiO2)

Ferruginous Sandstone (Ironstone) (Arenite with Limonite/Goethite cement) — sedimentary

Ferruginous Sandstone (Ironstone)

Arenite with Limonite/Goethite cement

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Garnet Schist (Almandine Garnet-bearing Mica Schist) — metamorphic

Garnet Schist

Almandine Garnet-bearing Mica Schist

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

Quartz (Milky/Crystalline)

Silicon Dioxide (SiO2)

Polished chalcedony with iron-oxide cap (probable carnelian/agate) (Microcrystalline quartz, SiO₂, with hematite/goethite inclusions) — mineral

Polished chalcedony with iron-oxide cap (probable carnelian/agate)

Microcrystalline quartz, SiO₂, with hematite/goethite inclusions

Quartz geode/vug specimen (Quartz (SiO₂), likely in a weathered iron-oxide-rich host rock) — mineral

Quartz geode/vug specimen

Quartz (SiO₂), likely in a weathered iron-oxide-rich host rock

Quartz geode (Microcrystalline quartz (SiO₂), likely a small druzy quartz geode) — mineral

Quartz geode

Microcrystalline quartz (SiO₂), likely a small druzy quartz geode

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz on Matrix

Silicon Dioxide (SiO2)

River Rock (N/A - Generic term for water-smoothed rock) — sedimentary

River Rock

N/A - Generic term for water-smoothed rock

Chalcedony / Agate Pebble (Silicon Dioxide (SiO2)) — mineral

Chalcedony / Agate Pebble

Silicon Dioxide (SiO2)

Agate (Cryptocrystalline quartz, Chalcedony (SiO2)) — mineral

Agate

Cryptocrystalline quartz, Chalcedony (SiO2)

Jasper Pebble (SiO2 (Microcrystalline Quartz)) — sedimentary

Jasper Pebble

SiO2 (Microcrystalline Quartz)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Mixed River Pebbles and Jasper (Siliciclastic sediment and microcrystalline quartz) — sedimentary

Mixed River Pebbles and Jasper

Siliciclastic sediment and microcrystalline quartz

Sandstone (with secondary weathering/concretion) (Arenite (composed primarily of Quartz, SiO2)) — sedimentary

Sandstone (with secondary weathering/concretion)

Arenite (composed primarily of Quartz, SiO2)

Granite Pebble (Felsic Igneous Rock (Granitic composition)) — igneous

Granite Pebble

Felsic Igneous Rock (Granitic composition)

Granite (weathered, possibly porphyritic) (Granite; primarily quartz (SiO₂), feldspars, and mica/amphibole) — igneous

Granite (weathered, possibly porphyritic)

Granite; primarily quartz (SiO₂), feldspars, and mica/amphibole

Rounded sandstone pebble (Quartz-rich sandstone, likely arkosic or lithic sandstone) — sedimentary

Rounded sandstone pebble

Quartz-rich sandstone, likely arkosic or lithic sandstone

Greenstone, likely serpentinite (Serpentinite; predominantly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chlorite, and talc) — metamorphic

Greenstone, likely serpentinite

Serpentinite; predominantly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chlorite, and talc

Weathered granite pebble (Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust) — igneous

Weathered granite pebble

Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust

Quartz geode (Quartz (SiO₂), likely in a chalcedony or other silica-rich host rind) — mineral

Quartz geode

Quartz (SiO₂), likely in a chalcedony or other silica-rich host rind

Sandstone (Lithic Wacke) (Clastic sedimentary rock (primarily SiO2 with rock fragments)) — sedimentary

Sandstone (Lithic Wacke)

Clastic sedimentary rock (primarily SiO2 with rock fragments)

River Pebble (likely Quartzite or Diorite) (Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock) — metamorphic

River Pebble (likely Quartzite or Diorite)

Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock

River Rocks (Basalt and Sedimentary Stones) (Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock) — igneous and sedimentary

River Rocks (Basalt and Sedimentary Stones)

Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock

igneous and sedimentary

Quartz geode or quartz-bearing rock (Quartz (SiO₂), likely in a chalcedony- or basalt-hosted cavity) — mineral

Quartz geode or quartz-bearing rock

Quartz (SiO₂), likely in a chalcedony- or basalt-hosted cavity

Quartz-veined metamorphic rock, likely greenschist or altered metavolcanic (Chlorite–actinolite–epidote-bearing metavolcanic rock with quartz veins; exact identification requires testing) — metamorphic

Quartz-veined metamorphic rock, likely greenschist or altered metavolcanic

Chlorite–actinolite–epidote-bearing metavolcanic rock with quartz veins; exact identification requires testing

Weathered iron-rich rock, possibly limonite/goethite-bearing breccia (Hydrated iron oxides/hydroxides, mainly limonite (mixture) and goethite, FeO(OH)·nH₂O) — mineral

Weathered iron-rich rock, possibly limonite/goethite-bearing breccia

Hydrated iron oxides/hydroxides, mainly limonite (mixture) and goethite, FeO(OH)·nH₂O

Weathered iron-rich rock, possibly laterite or limonite-bearing quartzite (Limonite/goethite mixture, commonly FeO(OH)·nH₂O, with possible quartz and iron oxides) — mineral

Weathered iron-rich rock, possibly laterite or limonite-bearing quartzite

Limonite/goethite mixture, commonly FeO(OH)·nH₂O, with possible quartz and iron oxides

Chalcedony Geode Fragment (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chalcedony Geode Fragment

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz Druzy (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy

Silicon Dioxide (SiO2)