Rock Identifier

Category

Not A Rock (Synthetic Material)

Browse not a rock (synthetic material) specimens identified by the Rock Identifier community.

Learn about Not A Rock (Synthetic Material) in the encyclopedia

Dunite

Metarhyolite

Limonite

Rock Salt

Coral Rock

Rock Gypsum

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Yttrium Aluminum Garnet

Yttrium Aluminum Garnet

Zincite

Opalite

Pumice (Vesicular volcanic glass (primarily SiO2)) — igneous

Pumice

Vesicular volcanic glass (primarily SiO2)

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

Quartz Vein Outcrop

Silicon Dioxide (SiO2)

Fossilized oyster or bivalve shell (Fossil Gryphaeidae or Ostreoidea; calcitic shell, CaCO₃) — fossil

Fossilized oyster or bivalve shell

Fossil Gryphaeidae or Ostreoidea; calcitic shell, CaCO₃

Mixed Tumbled Rocks and Minerals Collection (Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)) — mineral

Mixed Tumbled Rocks and Minerals Collection

Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)

Serpentine (Antigorite / Lizardite / Chrysotile mix; (Mg, Fe)3Si2O5(OH)4) — metamorphic

Serpentine

Antigorite / Lizardite / Chrysotile mix; (Mg, Fe)3Si2O5(OH)4

Serpentine pendant (Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄) — metamorphic

Serpentine pendant

Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄

Dark igneous rock, likely basalt (Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine) — igneous

Dark igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine

Polished porphyritic basalt (likely) (Basalt, a fine-grained mafic volcanic rock; visible inclusions may be olivine, feldspar, or vesicle infillings) — igneous

Polished porphyritic basalt (likely)

Basalt, a fine-grained mafic volcanic rock; visible inclusions may be olivine, feldspar, or vesicle infillings

Basalt (Mafic volcanic rock (various silicate minerals)) — igneous

Basalt

Mafic volcanic rock (various silicate minerals)

Sodalite (Sodalite - Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

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

Sandstone (Quartzose)

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely Graywacke or Arkose variant) (Clastic Sedimentary Rock (SiO2 based)) — sedimentary

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 based)

Pink Granite (Granite (Phaneritic intrusive igneous rock)) — igneous

Pink Granite

Granite (Phaneritic intrusive igneous rock)

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

Ferruginous Sandstone (Ironstone)

Sedimentary rock with Limonite/Goethite cement

Rounded basalt cobble (probable) (Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene) — igneous

Rounded basalt cobble (probable)

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene

Fossilized Coprolite (Coprolite (fossilized feces)) — sedimentary

Fossilized Coprolite

Coprolite (fossilized feces)

Diorite with Quartz contact (Intermediate Phaneritic Igneous Rock (Diorite)) — igneous

Diorite with Quartz contact

Intermediate Phaneritic Igneous Rock (Diorite)

Pebble (Clast (specifically a granule or small pebble)) — Sedimentary

Pebble

Clast (specifically a granule or small pebble)

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

Chert / Jasper

Silicon Dioxide (SiO2)

Blue Quartzite (Blue Aventurine) (Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebbeckite) — metamorphic

Blue Quartzite (Blue Aventurine)

Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebbeckite

Peridotite (Dunite/Peridot Xenolith) (Peridotite (predominantly Olivine (Mg, Fe)2SiO4)) — igneous

Peridotite (Dunite/Peridot Xenolith)

Peridotite (predominantly Olivine (Mg, Fe)2SiO4)

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

Limestone (River Stone)

Calcium Carbonate (CaCO3)

Granodiorite Pebble (Granodiorite) — igneous

Granodiorite Pebble

Granodiorite

Chert (Jasper/Agate variety) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Jasper/Agate variety)

Microcrystalline quartz (SiO2)

Chert (Jasper variety) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Jasper variety)

Microcrystalline quartz (SiO2)

Chert (specifically Flint or Jasper variant) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Flint or Jasper variant)

Cryptocrystalline Quartz (SiO2)

Tumbled citrine or iron-stained quartz (Quartz (SiO₂), likely iron-oxide-stained or natural citrine) — mineral

Tumbled citrine or iron-stained quartz

Quartz (SiO₂), likely iron-oxide-stained or natural citrine

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

Red Sandstone

Arenite with Hematite (Fe2O3)

Sandstone (Ferruginous) (Arenite (Fe-rich)) — sedimentary

Sandstone (Ferruginous)

Arenite (Fe-rich)

Sandstone with Iron Oxide Staining (Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone with Iron Oxide Staining

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Basalt Gravel (Aphanitic Mafic Igneous Rock) — igneous

Basalt Gravel

Aphanitic Mafic Igneous Rock

Petrified Wood (Silicified Wood (primarily Quartz/SiO2)) — mineral

Petrified Wood

Silicified Wood (primarily Quartz/SiO2)

Chert (Black Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Black Flint)

Silicon Dioxide (SiO2)

Polished brown mineral fragment, likely quartz-rich iron-stained material (Possibly quartz (SiO₂) with iron-oxide inclusions; exact identification is uncertain from the image) — mineral

Polished brown mineral fragment, likely quartz-rich iron-stained material

Possibly quartz (SiO₂) with iron-oxide inclusions; exact identification is uncertain from the image

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

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

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Tumbled dark pebble (Indeterminate; likely basalt or fine-grained dark metamorphic rock) — mineral

Tumbled dark pebble

Indeterminate; likely basalt or fine-grained dark metamorphic rock

Granite pebble (Granite, chiefly quartz, feldspar, and mica) — igneous

Granite pebble

Granite, chiefly quartz, feldspar, and mica

Brown Sandstone (Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)) — sedimentary

Brown Sandstone

Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)

Porphyritic basalt (likely amygdaloidal basalt) (Basalt containing larger plagioclase crystals and pale vesicle-fill minerals, commonly calcite, zeolite, or quartz) — igneous

Porphyritic basalt (likely amygdaloidal basalt)

Basalt containing larger plagioclase crystals and pale vesicle-fill minerals, commonly calcite, zeolite, or quartz

Siltstone Pebble (Siltstone (composed of siliciclastic grains)) — sedimentary

Siltstone Pebble

Siltstone (composed of siliciclastic grains)

Pink Quartzite (Quartzite (primarily SiO2 with trace Fe2O3)) — metamorphic

Pink Quartzite

Quartzite (primarily SiO2 with trace Fe2O3)