Rock Identifier

Category

Non Geological

Browse non geological specimens identified by the Rock Identifier community.

Learn about Non Geological in the encyclopedia

Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Mint Opal

Plazolite

Bixbite

Red faceted gemstone ring (Likely synthetic ruby or red spinel; exact identification requires testing) — gemstone

Red faceted gemstone ring

Likely synthetic ruby or red spinel; exact identification requires testing

Schist with Garnet inclusions (Garnet-mica-schist) — metamorphic

Schist with Garnet inclusions

Garnet-mica-schist

Tumbled green aventurine (likely) (Quartz (SiO₂) with fuchsite or other green mica inclusions) — mineral

Tumbled green aventurine (likely)

Quartz (SiO₂) with fuchsite or other green mica inclusions

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Limestone with Chert Nodule (Carbonate rock (CaCO3) with Microcrystalline Silicon Dioxide (SiO2) inclusion) — sedimentary

Limestone with Chert Nodule

Carbonate rock (CaCO3) with Microcrystalline Silicon Dioxide (SiO2) inclusion

Conglomerate (Conglomerate / Lithic Wacke) — sedimentary

Conglomerate

Conglomerate / Lithic Wacke

Weathered ironstone concretion (probable limonite/goethite nodule) (Limonite-goethite-rich iron-oxide concretion; chiefly FeO(OH)·nH₂O) — mineral

Weathered ironstone concretion (probable limonite/goethite nodule)

Limonite-goethite-rich iron-oxide concretion; chiefly FeO(OH)·nH₂O

Obsidian (Volcanic Glass (70-75% SiO2)) — igneous

Obsidian

Volcanic Glass (70-75% SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Snowflake Obsidian (Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)) — igneous

Snowflake Obsidian

Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)

Blue faceted gemstones, likely blue sapphire (Corundum (Al₂O₃), blue varieties colored chiefly by iron and titanium) — gemstone

Blue faceted gemstones, likely blue sapphire

Corundum (Al₂O₃), blue varieties colored chiefly by iron and titanium

Siltstone (Siltstone (composed of microscopic quartz and clay minerals)) — sedimentary

Siltstone

Siltstone (composed of microscopic quartz and clay minerals)

Obsidian (Volcanic Glass (70% or more SiO2)) — igneous

Obsidian

Volcanic Glass (70% or more SiO2)

Asphalt (Aggregate) (Bituminous macadam / Concrete Aggregate) — sedimentary

Asphalt (Aggregate)

Bituminous macadam / Concrete Aggregate

Obsidian Arrowhead (Obsidian (volcanic glass, SiO2 rich)) — igneous

Obsidian Arrowhead

Obsidian (volcanic glass, SiO2 rich)

Obsidian (Volcanic Glass (70% or more SiO2)) — igneous

Obsidian

Volcanic Glass (70% or more SiO2)

Fossil bone or tooth fragment (Mineralized fossil vertebrate bone/tooth; exact taxon cannot be determined from the photograph) — fossil

Fossil bone or tooth fragment

Mineralized fossil vertebrate bone/tooth; exact taxon cannot be determined from the photograph

Opalite (Opalescent Glass (SiO2 + coloring agents)) — Mineral (Synthetic/Man-made)

Opalite

Opalescent Glass (SiO2 + coloring agents)

Mineral (Synthetic/Man-made)

Obsidian (Volcanic Glass (Amorphous SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous SiO2)

Obsidian (Volcanic Glass (predominantly SiO2)) — igneous

Obsidian

Volcanic Glass (predominantly SiO2)

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

White Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Zebra Rock (Zebra Stone / Ribbon Stone) (Siltstone with Ferruginous Banding (Primarily Quartz, Kaolinite, and Hematite)) — sedimentary

Zebra Rock (Zebra Stone / Ribbon Stone)

Siltstone with Ferruginous Banding (Primarily Quartz, Kaolinite, and Hematite)

Sandstone pebble (Sandstone (arenite / quartzarenite)) — sedimentary

Sandstone pebble

Sandstone (arenite / quartzarenite)

Concretion (likely iron-rich sandstone or claystone concretion) (Diagenetic carbonate/iron-oxide concretion; exact mineralogy requires testing) — sedimentary

Concretion (likely iron-rich sandstone or claystone concretion)

Diagenetic carbonate/iron-oxide concretion; exact mineralogy requires testing

Black Obsidian (Volcanic Glass (Amorphous Silicon Dioxide, SiO2)) — igneous

Black Obsidian

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Gold Ore (in Quartz/Sulfide matrix) (Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)) — mineral

Gold Ore (in Quartz/Sulfide matrix)

Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)

Fine-grained gray stone, likely slate or weathered basalt (Indeterminate; possible slate (foliated phyllite-grade shale)) — metamorphic

Fine-grained gray stone, likely slate or weathered basalt

Indeterminate; possible slate (foliated phyllite-grade shale)

Black Obsidian (Obsidian (Amorphous volcanic glass, SiO2)) — igneous

Black Obsidian

Obsidian (Amorphous volcanic glass, SiO2)

Quartzite with Garnet (Garnetiferous Quartzite (SiO2 + X3Y2(SiO4)3)) — metamorphic

Quartzite with Garnet

Garnetiferous Quartzite (SiO2 + X3Y2(SiO4)3)

Snowflake Obsidian (Spherulitic Obsidian (Volcanic Glass with Cristobalite inclusions)) — igneous

Snowflake Obsidian

Spherulitic Obsidian (Volcanic Glass with Cristobalite inclusions)

Polished yellow-brown quartzite or jasper (Quartz-rich quartzite; possibly iron-stained jasper (microcrystalline SiO₂)) — metamorphic

Polished yellow-brown quartzite or jasper

Quartz-rich quartzite; possibly iron-stained jasper (microcrystalline SiO₂)

Black Obsidian (Volcanic Glass (70–75% SiO2 plus MgO, Fe3O4)) — igneous

Black Obsidian

Volcanic Glass (70–75% SiO2 plus MgO, Fe3O4)

Black onyx or black agate bead bracelet (Microcrystalline quartz, chiefly chalcedony (SiO₂); commonly sold as black onyx, sometimes dyed black agate) — gemstone

Black onyx or black agate bead bracelet

Microcrystalline quartz, chiefly chalcedony (SiO₂); commonly sold as black onyx, sometimes dyed black agate

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Slag (Glassy silicate byproduct (anthropogenic material)) — industrial byproduct

Slag

Glassy silicate byproduct (anthropogenic material)

industrial byproduct

Common Opal (Potch) (Opal (Hydrated silica, SiO2·nH2O)) — mineral

Common Opal (Potch)

Opal (Hydrated silica, SiO2·nH2O)

Blue sapphire ring (Corundum, Al₂O₃; blue color typically from trace iron and titanium) — gemstone

Blue sapphire ring

Corundum, Al₂O₃; blue color typically from trace iron and titanium

Black Obsidian (Amorphous volcanic glass (SiO2)) — igneous

Black Obsidian

Amorphous volcanic glass (SiO2)

Acrylic or Resin (Synthetic Imitation) (Polymethyl Methacrylate (PMMA) or Polyepoxide) — Synthetic/Man-made Polymer

Acrylic or Resin (Synthetic Imitation)

Polymethyl Methacrylate (PMMA) or Polyepoxide

Synthetic/Man-made Polymer