Rock Identifier

Category

Not A Rock (Synthetic Material)

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

Petrified Wood (Silicified wood (Quartz/Chalcedony - SiO2)) — sedimentary

Petrified Wood

Silicified wood (Quartz/Chalcedony - SiO2)

Chert (Nodule / Geode fragment) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Nodule / Geode fragment)

Microcrystalline Quartz (SiO2)

Mica Schist (Mica Schist (predominantly Muscovite or Biotite sheet silicates)) — metamorphic

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

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)

Chert (Grey-Green Flint) (Microcrystalline silicon dioxide (SiO2)) — sedimentary

Chert (Grey-Green Flint)

Microcrystalline silicon dioxide (SiO2)

Asphalt (Bituminous Concrete) (Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)) — not a rock (anthropogenic material/technofossil)

Asphalt (Bituminous Concrete)

Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)

not a rock (anthropogenic material/technofossil)

Granite Cobble (River Stone) (Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)) — igneous

Granite Cobble (River Stone)

Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)

Coquina / Shelly Limestone (Bioclastic Limestone (composed of CaCO3)) — sedimentary

Coquina / Shelly Limestone

Bioclastic Limestone (composed of CaCO3)

Green Fluorite in Host Rock (Fluorite (Calcium Fluoride, CaF2)) — mineral

Green Fluorite in Host Rock

Fluorite (Calcium Fluoride, CaF2)

Chert (Jasper and Chalcedony) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper and Chalcedony)

Silicon Dioxide (SiO2)

Jasper (Red Jasper) (Silicon Dioxide (SiO₂)) — sedimentary

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Quartzite (Yellow/Tan) (Metamorphic Rock composed of Quartz (SiO₂)) — metamorphic

Quartzite (Yellow/Tan)

Metamorphic Rock composed of Quartz (SiO₂)

Diorite (Diorite (Intermediate intrusive igneous rock)) — igneous

Diorite

Diorite (Intermediate intrusive igneous rock)

Basalt (Basalt (Fine-grained extrusive igneous rock)) — igneous

Basalt

Basalt (Fine-grained extrusive igneous rock)

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

Ferruginous Sandstone (Iron-rich Sandstone)

Ferruginous Arenite

Nuummite (Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite)) — metamorphic

Nuummite

Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite)

Mother of Pearl (Nacre) (Calcium Carbonate (primarily aragonite, with conchiolin)) — Organic Gemstone/Biomineral

Mother of Pearl (Nacre)

Calcium Carbonate (primarily aragonite, with conchiolin)

Organic Gemstone/Biomineral

Granite Pebble (Granite (Phaneritic intrusive igneous rock consisting of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite Pebble

Granite (Phaneritic intrusive igneous rock consisting of Quartz, Alkali Feldspar, and Plagioclase)

Granite (Phaneritic Felsic Igneous Rock (primarily Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Phaneritic Felsic Igneous Rock (primarily Quartz, Alkali Feldspar, and Plagioclase)

Ironstone with Limonite/Goethite coating (Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)) — sedimentary

Ironstone with Limonite/Goethite coating

Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)

Chert (Cherty Flint/Jasper variety) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Cherty Flint/Jasper variety)

Microcrystalline or cryptocrystalline 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)

Petrified Wood (Silicified Wood (SiO2)) — metamorphic

Petrified Wood

Silicified Wood (SiO2)

Sandstone (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Brecciated Jasper (Silicon Dioxide (SiO2) with varying mineral inclusions (Iron Oxide, Hematite, Clay)) — sedimentary (clastic/chemical)

Brecciated Jasper

Silicon Dioxide (SiO2) with varying mineral inclusions (Iron Oxide, Hematite, Clay)

sedimentary (clastic/chemical)

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

Quartzite

Quartzite (composed primarily of Quartz, SiO2)

Milky Quartz (Water-worn Pebble) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Chert (Flint variety) (Chert (SiO2)) — sedimentary

Chert (Flint variety)

Chert (SiO2)

Banded Gneiss (River Rock/Pebble) (Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)) — Metamorphic Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Metamorphic Rock

Basalt (Vesicular Basalt) — igneous

Basalt

Vesicular Basalt

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

Quartzite (River Pebble)

Quartzite (SiO2)

Biotite Schist (Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)) — metamorphic

Biotite Schist

Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)

Quartz (Gravel fragment) (Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz (Gravel fragment)

Quartz (Silicon Dioxide, SiO2)

Red Jasper (Jasper (SiO2) with Hematite (Fe2O3) inclusions) — sedimentary

Red Jasper

Jasper (SiO2) with Hematite (Fe2O3) inclusions

Slag (Anthropogenic Vitrophyre (Iron or Smelting Slag)) — Mineral-like byproduct

Slag

Anthropogenic Vitrophyre (Iron or Smelting Slag)

Mineral-like byproduct

Chert (variations include Flint or Jasper) (Chert (chemical sedimentary rock), Quartz (SiO2)) — sedimentary

Chert (variations include Flint or Jasper)

Chert (chemical sedimentary rock), Quartz (SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)

Limonite (Iron Ore/Sandstone mixture) (Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix) — mineral

Limonite (Iron Ore/Sandstone mixture)

Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix

Red Sandstone (Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)) — sedimentary

Red Sandstone

Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)

Petrified Wood (Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)) — metamorphic

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)

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

Fulgurite

Fulgurite (Lechatelierite), amorphous SiO2