Rock Identifier

Category

Synthetic Material (Not A Rock Or Mineral)

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

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

Rock Salt

Rock Gypsum

Coral Rock

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Yttrium Aluminum Garnet

Yttrium Aluminum Garnet

Zincite

Halite

Opalite

Lead Feldspar

Dolomite

Serpentinite (Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4) — metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

Tumbled yellow jasper (likely serpentine or calcite-rich stone) (Jasper: microcrystalline quartz (SiO₂); exact yellow veining may indicate serpentine, calcite, or iron oxides) — mineral

Tumbled yellow jasper (likely serpentine or calcite-rich stone)

Jasper: microcrystalline quartz (SiO₂); exact yellow veining may indicate serpentine, calcite, or iron oxides

Iron-rich brown stone, possibly weathered chert or ironstone (Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)) — sedimentary

Iron-rich brown stone, possibly weathered chert or ironstone

Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)

Conglomerate (Polymictic Conglomerate) — sedimentary

Conglomerate

Polymictic Conglomerate

Biotite schist (likely graphite-bearing) (Mica schist; chiefly quartz + biotite mica, with possible graphite and feldspar) — metamorphic

Biotite schist (likely graphite-bearing)

Mica schist; chiefly quartz + biotite mica, with possible graphite and feldspar

Pumice (Pumice (volcanic rock)) — Igneous

Pumice

Pumice (volcanic rock)

Mookaite Jasper (Silicified Radiolarite (SiO2)) — sedimentary

Mookaite Jasper

Silicified Radiolarite (SiO2)

Fulgurite (Fulgurite (Lechatelierite), amorphous SiO2) — metamorphic

Fulgurite

Fulgurite (Lechatelierite), amorphous SiO2

Granodiorite (River Pebble) (Granodiorite) — igneous

Granodiorite (River Pebble)

Granodiorite

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite) (Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)) — Sedimentary

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Unakite (Epidote–K-feldspar–quartz granitoid (often called unakite)) — metamorphic

Unakite

Epidote–K-feldspar–quartz granitoid (often called unakite)

Mica Schist (Schist (Muscovite-Biotite Schist)) — metamorphic

Mica Schist

Schist (Muscovite-Biotite Schist)

Chert (Yellow Jasper variant) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Quartz (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Jasper (Microcrystalline Quartz (Chalcedony), SiO2) — sedimentary

Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Gneiss pebble (Banded gneiss, commonly quartz–feldspar–biotite gneiss) — metamorphic

Gneiss pebble

Banded gneiss, commonly quartz–feldspar–biotite gneiss

Mica Schist (Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)) — metamorphic

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

Likely basalt (Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase, clinopyroxene, and often olivine) — igneous

Likely basalt

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase, clinopyroxene, and often olivine

Limestone (Sedimentary rock composed mainly of calcium carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary rock composed mainly of calcium carbonate (CaCO3)

Petrified Wood (Silicon Dioxide Fossilized Wood (SiO2)) — fossil

Petrified Wood

Silicon Dioxide Fossilized Wood (SiO2)

Limestone (Weathered Aggregate) (Sedimentary Carbonate Rock (CaCO3)) — sedimentary

Limestone (Weathered Aggregate)

Sedimentary Carbonate Rock (CaCO3)

Chert (River Stone) (Silicon Dioxide (SiO2)) — sedimentary

Chert (River Stone)

Silicon Dioxide (SiO2)

Sandstone (Garden Boulder) (Sandstone (SiO2 dominated)) — sedimentary

Sandstone (Garden Boulder)

Sandstone (SiO2 dominated)

Chert (Yellow/Tan Variety) (Chert (SiO2)) — sedimentary

Chert (Yellow/Tan Variety)

Chert (SiO2)

Chert (specifically Tan/Gray Chert) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Chert Nodules (with Quartz Inclusions) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodules (with Quartz Inclusions)

Microcrystalline Quartz (SiO2)

Pumice (Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)) — igneous

Pumice

Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)

Serpentine (likely serpentinized ultramafic rock) (Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; commonly derived from peridotite) — metamorphic

Serpentine (likely serpentinized ultramafic rock)

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; commonly derived from peridotite

Rounded reddish-brown pebble (Likely ferruginous sandstone or iron-rich quartzite; exact identification requires a fresh surface and tests) — sedimentary

Rounded reddish-brown pebble

Likely ferruginous sandstone or iron-rich quartzite; exact identification requires a fresh surface and tests

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (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

Mixed river pebbles and quartz-rich specimens (Polymictic fluvial gravel; likely quartz, quartzite, chert, and weathered feldspathic rocks) — sedimentary

Mixed river pebbles and quartz-rich specimens

Polymictic fluvial gravel; likely quartz, quartzite, chert, and weathered feldspathic rocks

Strawberry Quartz (Silicon Dioxide (SiO2) with inclusions of Goethite or Hematite) — Mineral

Strawberry Quartz

Silicon Dioxide (SiO2) with inclusions of Goethite or Hematite

Basalt (River Pebble) (Basalt) — igneous

Basalt (River Pebble)

Basalt

Chert (River Pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Mica Schist (Mica Schist (primarily Muscovite and Biotite composition)) — metamorphic

Mica Schist

Mica Schist (primarily Muscovite and Biotite composition)

Petrified Wood (Silicified wood (Quartz / Chalcedonized wood, SiO2)) — sedimentary

Petrified Wood

Silicified wood (Quartz / Chalcedonized wood, SiO2)

Riverstone Quartzite (Water-worn Siltstone/Quartzite) (Metamorphosed Quartz-rich Arenite (SiO2)) — metamorphic

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

Polished dark stone, likely basalt (Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine) — igneous

Polished dark stone, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine

Quartzite (or Quartz Slab) (SiO2 (Silicon Dioxide)) — metamorphic

Quartzite (or Quartz Slab)

SiO2 (Silicon Dioxide)

Porphyry (Porphyritic Igneous Rock) — igneous

Porphyry

Porphyritic Igneous Rock

Greenstone / Serpentinite Pebble (Serpentinite (Hydrated Magnesium Silicate, Mg3Si2O5(OH)4)) — metamorphic

Greenstone / Serpentinite Pebble

Serpentinite (Hydrated Magnesium Silicate, Mg3Si2O5(OH)4)