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

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Crushed Limestone (Calcium Carbonate (CaCO3)) — Sedimentary

Crushed Limestone

Calcium Carbonate (CaCO3)

Quartz-rich granite or granitic pebble (Granite; primarily quartz (SiO₂), potassium feldspar, plagioclase, and minor mica/iron oxides) — igneous

Quartz-rich granite or granitic pebble

Granite; primarily quartz (SiO₂), potassium feldspar, plagioclase, and minor mica/iron oxides

Mica Schist (Mica Schist (Complex Silicate Rock)) — metamorphic

Mica Schist

Mica Schist (Complex Silicate Rock)

Fossil brachiopod or bivalve shell (Likely a fossilized brachiopod; precise genus cannot be determined from the photograph) — fossil

Fossil brachiopod or bivalve shell

Likely a fossilized brachiopod; precise genus cannot be determined from the photograph

Chert (Iron-stained) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Chert / Flint Nodules in Sandstone (Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock) — sedimentary

Chert / Flint Nodules in Sandstone

Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock

Granite with Epidote (Granite, containing quartz, feldspar, and epidote) — Igneous

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone (Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)) — sedimentary

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Biotite-bearing granite or granitic gneiss (Quartz–feldspar–biotite assemblage; possibly metamorphosed granite (gneiss)) — igneous

Biotite-bearing granite or granitic gneiss

Quartz–feldspar–biotite assemblage; possibly metamorphosed granite (gneiss)

Quartz (Quartz Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Quartz Pebble)

Silicon Dioxide (SiO2)

Asphalt (Road Aggregate) (Bituminous conglomerate) — sedimentary

Asphalt (Road Aggregate)

Bituminous conglomerate

Banded sandstone pebble (Quartz-rich lithic sandstone; exact provenance and composition require testing) — sedimentary

Banded sandstone pebble

Quartz-rich lithic sandstone; exact provenance and composition require testing

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

White quartz in dark matrix (likely quartz-bearing breccia or polished composite specimen) (Quartz, SiO₂, in an unidentified dark silicate matrix) — mineral

White quartz in dark matrix (likely quartz-bearing breccia or polished composite specimen)

Quartz, SiO₂, in an unidentified dark silicate matrix

Weathered iron-rich concretion or laterite fragment (Ferruginous concretion, likely goethite/limonite (hydrated iron oxides) in a clay-rich matrix) — sedimentary

Weathered iron-rich concretion or laterite fragment

Ferruginous concretion, likely goethite/limonite (hydrated iron oxides) in a clay-rich matrix

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

Granite

Granite (Phaneritic intrusive igneous rock)

Weathered granite or granitic gneiss (Granite; primarily quartz, feldspar, and mica (possibly metamorphosed to gneiss)) — igneous

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica (possibly metamorphosed to gneiss)

Granite boulder (Granite, composed mainly of quartz, alkali feldspar, plagioclase, and minor mica/amphibole) — igneous

Granite boulder

Granite, composed mainly of quartz, alkali feldspar, plagioclase, and minor mica/amphibole

Polished orbicular jasper (Orbicular jasper; microcrystalline quartz (SiO₂) with hematite/goethite and other silicate inclusions) — sedimentary

Polished orbicular jasper

Orbicular jasper; microcrystalline quartz (SiO₂) with hematite/goethite and other silicate inclusions

Coquina or Fossiliferous Limestone (Biogenic Limestone (Calcite/Aragonite CaCO3)) — sedimentary

Coquina or Fossiliferous Limestone

Biogenic Limestone (Calcite/Aragonite CaCO3)

Olivine Peridotite (Peridotite (comprising Olivine (Mg,Fe)2SiO4 and Pyroxene)) — igneous

Olivine Peridotite

Peridotite (comprising Olivine (Mg,Fe)2SiO4 and Pyroxene)

Pink Granite (Phaneritic Igneous Rock (high K-feldspar content)) — igneous

Pink Granite

Phaneritic Igneous Rock (high K-feldspar content)

Coal (Bituminous) (Organic sedimentary rock primarily consisting of carbon (C)) — sedimentary

Coal (Bituminous)

Organic sedimentary rock primarily consisting of carbon (C)

Granite Pebble (Felsic Plutonic Rock (primarily Quartz, Feldspar, and Mica)) — igneous

Granite Pebble

Felsic Plutonic Rock (primarily Quartz, Feldspar, and Mica)

Chert (Green variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Green variety)

Silicon Dioxide (SiO2)

Chert (Quartz Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Quartz Pebble)

Silicon Dioxide (SiO2)

Polished granite (Granite; chiefly quartz, feldspar, and mica/amphibole) — igneous

Polished granite

Granite; chiefly quartz, feldspar, and mica/amphibole

Pumice (Pumice (a highly vesicular volcanic rock)) — igneous

Pumice

Pumice (a highly vesicular volcanic rock)

Granite (Weathered) (Course-grained Intrusive Igneous Rock) — igneous

Granite (Weathered)

Course-grained Intrusive Igneous Rock

Possible iron-rich chert or slag-like rock (Microcrystalline quartz (SiO₂), possibly iron-stained chert; exact identification is uncertain from the image) — sedimentary

Possible iron-rich chert or slag-like rock

Microcrystalline quartz (SiO₂), possibly iron-stained chert; exact identification is uncertain from the image

Red-and-cream jasper (Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides) — mineral

Red-and-cream jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Breccia (Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)) — sedimentary

Breccia

Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)

Sandstone (Arenite (siliciclastic sedimentary rock composed mostly of quartz)) — sedimentary

Sandstone

Arenite (siliciclastic sedimentary rock composed mostly of quartz)

Chert (Chert (Microcrystalline Silica, SiO2)) — sedimentary

Chert

Chert (Microcrystalline Silica, SiO2)

Biotite-bearing gneiss or schist (Quartz–feldspar–biotite metamorphic rock) — metamorphic

Biotite-bearing gneiss or schist

Quartz–feldspar–biotite metamorphic rock

Slag (Ferrous Slag (Siliceous industrial waste)) — Anthropogenic (Man-made industrial byproduct)

Slag

Ferrous Slag (Siliceous industrial waste)

Anthropogenic (Man-made industrial byproduct)

Pink-and-white quartz-rich rock, likely rose quartz or quartzite (Quartz (SiO₂), possibly rose-quartz-bearing quartzite; minor iron-oxide staining) — metamorphic

Pink-and-white quartz-rich rock, likely rose quartz or quartzite

Quartz (SiO₂), possibly rose-quartz-bearing quartzite; minor iron-oxide staining

Weathered granite or granitic gneiss (Granite; chiefly quartz, feldspar, and mica (possibly gneissic if foliation is confirmed)) — igneous

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica (possibly gneissic if foliation is confirmed)