Rock Identifier

Category

Not A Natural Rock

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

Learn about Not A Natural Rock in the encyclopedia

Asphalt Rock

Rock Gypsum

Coral Rock

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Chalk

Obsidian

Baddeleyite

Cataclasite

Anorthosite

Kimberlite

Hag Stone (Adder Stone / Geode-bearing Pebble) (Sedimentary Rock with Cavity (often Quartzite, Limestone, or Sandstone)) — sedimentary

Hag Stone (Adder Stone / Geode-bearing Pebble)

Sedimentary Rock with Cavity (often Quartzite, Limestone, or Sandstone)

Sandstone (with Iron Staining) (Clastic sedimentary rock (SiO2 with Fe2O3 oxides)) — sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 oxides)

Shale (Shale (composition varies: primarily clay minerals and quartz)) — sedimentary

Shale

Shale (composition varies: primarily clay minerals and quartz)

Polished amethyst-bearing rock, likely amethyst in matrix (Amethyst (purple quartz, SiO₂), with an unidentified dark host-rock matrix) — mineral

Polished amethyst-bearing rock, likely amethyst in matrix

Amethyst (purple quartz, SiO₂), with an unidentified dark host-rock matrix

Sandstone (Arenite (SiO2 principal component)) — sedimentary

Sandstone

Arenite (SiO2 principal component)

Sandstone (Sedimentary Rock (Quartz Arenite)) — sedimentary

Sandstone

Sedimentary Rock (Quartz Arenite)

Sandstone (Arenite (primarily Quartz, SiO2)) — sedimentary

Sandstone

Arenite (primarily Quartz, SiO2)

Pebble (Lithic fragment / Weathered rock fragment) — sedimentary

Pebble

Lithic fragment / Weathered rock fragment

Pink Agate (Chalcedony (SiO2)) — gemstone

Pink Agate

Chalcedony (SiO2)

Quartz-Veined Porphyritic Basalt (Igneous rock with quartz vein (SiO2)) — igneous

Quartz-Veined Porphyritic Basalt

Igneous rock with quartz vein (SiO2)

Crushed Stone Gravel (Crushed Limestone or Granite aggregate) — sedimentary

Crushed Stone Gravel

Crushed Limestone or Granite aggregate

Conglomerate (possibly concrete-like natural breccia) (Lithified, poorly sorted clastic rock with angular to subrounded mineral and rock fragments in a finer matrix) — sedimentary

Conglomerate (possibly concrete-like natural breccia)

Lithified, poorly sorted clastic rock with angular to subrounded mineral and rock fragments in a finer matrix

Weathered rock pebble, possibly sandstone (Likely quartz-rich sandstone; precise identification requires closer examination) — sedimentary

Weathered rock pebble, possibly sandstone

Likely quartz-rich sandstone; precise identification requires closer examination

Faceted Clear Quartz or Diamond Simulant (Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic) — gemstone

Faceted Clear Quartz or Diamond Simulant

Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic

Green glassy slag or manufactured glass bead (Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral) — mineral

Green glassy slag or manufactured glass bead

Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral

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

Clear Quartz Point

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 dominant)) — sedimentary

Sandstone

Arenite (SiO2 dominant)

Quartz-veined Sandstone (Quartzite-veined Arenite (SiO2)) — sedimentary

Quartz-veined Sandstone

Quartzite-veined Arenite (SiO2)

Tektite (specifically Indochinite) (Tektite (Natural silica glass)) — Mineraloid (Impact glass)

Tektite (specifically Indochinite)

Tektite (Natural silica glass)

Mineraloid (Impact glass)

Green Quartzite / Quartz Pebble (SiO2 (Silicon Dioxide with inclusions)) — metamorphic

Green Quartzite / Quartz Pebble

SiO2 (Silicon Dioxide with inclusions)

Sandstone Pebble (Quartz Sandstone) — sedimentary

Sandstone Pebble

Quartz Sandstone

Porous fossil coral fragment (Fossilized colonial coral; precise taxon cannot be determined from the image) — fossil

Porous fossil coral fragment

Fossilized colonial coral; precise taxon cannot be determined from the image

Amygdaloidal Basalt (Basalt (Igneous Volcanic Rock with secondary mineral infilling)) — igneous

Amygdaloidal Basalt

Basalt (Igneous Volcanic Rock with secondary mineral infilling)

Polished banded gneiss (Biotite–quartz–feldspar gneiss, locally migmatitic) — metamorphic

Polished banded gneiss

Biotite–quartz–feldspar gneiss, locally migmatitic

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)

Vesicular Basalt or Scoria (Basalt (extrusive volcanic rock)) — igneous

Vesicular Basalt or Scoria

Basalt (extrusive volcanic rock)

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

Rounded gray river pebble, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; commonly basalt (plagioclase ± pyroxene/olivine)

Smoky Quartz with Feldspar (SiO2 (Quartz) with KAlSi3O8 (Feldspar)) — mineral

Smoky Quartz with Feldspar

SiO2 (Quartz) with KAlSi3O8 (Feldspar)

Sandstone (Arenite (SiO2 variety)) — sedimentary

Sandstone

Arenite (SiO2 variety)

Yellow Ocher (Iron-rich Silt/Clay) (Goethite-rich Limonite (FeO(OH)qnH2O)) — sedimentary

Yellow Ocher (Iron-rich Silt/Clay)

Goethite-rich Limonite (FeO(OH)qnH2O)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Shale (Fissile Mudstone (Shale)) — sedimentary

Shale

Fissile Mudstone (Shale)

$Sandstone (with prominent jointing/fractures) (Arenite (composed primarily of SiO2)) — sedimentary$

Sandstone (with prominent jointing/fractures)

Arenite (composed primarily of SiO2)

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Ferruginous) (Arenite with Iron-Oxide Cement) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Conglomerate (Conglomerate (Detrital Sedimentary Rock)) — sedimentary

Conglomerate

Conglomerate (Detrital Sedimentary Rock)

Pumice (Pumice (Vesicular Felsic Volcanic Rock)) — igneous

Pumice

Pumice (Vesicular Felsic Volcanic Rock)

Sandstone (Arenite (with iron oxide cement)) — sedimentary

Sandstone

Arenite (with iron oxide cement)

Red coral chip bracelet (Corallium spp.; skeleton composed primarily of calcium carbonate (aragonite)) — gemstone

Red coral chip bracelet

Corallium spp.; skeleton composed primarily of calcium carbonate (aragonite)

Sandstone (Quartzite-rich Cobble) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Arenite (specifically Iron-stained Quartz Sandstone)) — sedimentary

Sandstone

Arenite (specifically Iron-stained Quartz Sandstone)

Fossiliferous Mudstone / River Pebble (Sedimentary rock with trace fossil or inclusion) — sedimentary

Fossiliferous Mudstone / River Pebble

Sedimentary rock with trace fossil or inclusion