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.

Banded Calcite (often sold as 'Mexican Onyx') (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate, CaCO3)

Coquina (Bioclastic Limestone (composed primarily of CaCO3)) — sedimentary

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Banded Iron Formation (BIF) with Quartz (Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)) — Sedimentary

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Chert (Flint Nodules) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint Nodules)

Cryptocrystalline Quartz (SiO2)

Granite Pebble (Pink Granite) (Phaneritic Igneous Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)) — igneous

Granite Pebble (Pink Granite)

Phaneritic Igneous Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

Quartzite Pebble (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (Quartzite (composed primarily of SiO2)) — metamorphic

Quartzite

Quartzite (composed primarily of SiO2)

Chert (Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2)

Diorite (Salt and Pepper Rock) (Phaneritic plutonic igneous rock (sodium-rich plagioclase feldspar and hornblende)) — igneous

Diorite (Salt and Pepper Rock)

Phaneritic plutonic igneous rock (sodium-rich plagioclase feldspar and hornblende)

Chert (specifically Jasper or Brown Chert node) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Jasper or Brown Chert node)

Microcrystalline Quartz (SiO2)

Crushed Stone (Likely Granite or Diabase) (Intrusive Igneous Rock (Granitoid/Gabbroid)) — igneous

Crushed Stone (Likely Granite or Diabase)

Intrusive Igneous Rock (Granitoid/Gabbroid)

Blue Apatite (Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)) — mineral

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Pink Quartzite (Silica (SiO2) - Metamorphic rock) — metamorphic

Pink Quartzite

Silica (SiO2) - Metamorphic rock

Limestone (Sedimentary Calcite (CaCO3)) — sedimentary

Limestone

Sedimentary Calcite (CaCO3)

Moonstone (Adularia or Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8), specifically with lamellar exsolution of albite and orthoclase.) — mineral

Moonstone

Adularia or Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8), specifically with lamellar exsolution of albite and orthoclase.

Chert (specifically Yellow Jasper/Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Quartz (SiO₂ (Silicon Dioxide)) — Mineral

Quartz

SiO₂ (Silicon Dioxide)

Veined Quartz (SiO2 (Silicon Dioxide)) — Mineral

Veined Quartz

SiO2 (Silicon Dioxide)

Yellow Quartzite River Cobble (Meta-quartzite (SiO2 with iron oxide staining)) — metamorphic

Yellow Quartzite River Cobble

Meta-quartzite (SiO2 with iron oxide staining)

Siltstone with flute casts or scratch marks (Clastic Sedimentary Rock (Siltstone/Fine-grained Sandstone)) — sedimentary

Siltstone with flute casts or scratch marks

Clastic Sedimentary Rock (Siltstone/Fine-grained Sandstone)

Basalt (Basalt) — igneous

Basalt

Basalt

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

Chert (Nodular)

Microcrystalline Silica (SiO2)

Slate (Slate (Metamorphic Rock)) — metamorphic

Slate

Slate (Metamorphic Rock)

Chert (varietal Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (varietal Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Siltstone (Siltstone (siliciclastic sedimentary rock)) — sedimentary

Siltstone

Siltstone (siliciclastic sedimentary rock)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Basalt (Basalt (Volcanic Mafic Rock)) — igneous

Basalt

Basalt (Volcanic Mafic Rock)

Fossiliferous Sedimentary Rock (Coquina/Limestone) (Fossiliferous Calcarenite / Bioclastic Limestone) — sedimentary

Fossiliferous Sedimentary Rock (Coquina/Limestone)

Fossiliferous Calcarenite / Bioclastic Limestone

Quartzite (River Pebble) (Metamorphic Quartz (SiO2)) — metamorphic

Quartzite (River Pebble)

Metamorphic Quartz (SiO2)

Ironstone (likely Limonite or Goethite) (Ferruginous sedimentary rock (FeO(OH)·nH2O)) — sedimentary

Ironstone (likely Limonite or Goethite)

Ferruginous sedimentary rock (FeO(OH)·nH2O)

Diorite (Salt and Pepper Rock) (Diorite) — igneous

Diorite (Salt and Pepper Rock)

Diorite

Sandstone (Sandstone (composed primarily of sand-sized minerals or rock grains)) — sedimentary

Sandstone

Sandstone (composed primarily of sand-sized minerals or rock grains)

Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Quartzite (SiO2)

Limestone (specifically Chalky Limestone) (Calcium Carbonate (CaCO3 / Calcite)) — sedimentary

Limestone (specifically Chalky Limestone)

Calcium Carbonate (CaCO3 / Calcite)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Chert (and its variety Flint) (Silicon dioxide (SiO2) / Microcrystalline quartz) — sedimentary

Chert (and its variety Flint)

Silicon dioxide (SiO2) / Microcrystalline quartz

Chert (Iron-stained) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

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

Granite

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

Conglomerate (Conglomerate) — Sedimentary Rock

Conglomerate

Conglomerate

Sedimentary Rock

Quartzite River Rock (Metamorphic Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

Coquina (Coquina (Bioclastic Calcarenite)) — sedimentary

Coquina

Coquina (Bioclastic Calcarenite)