Rock Identifier

Category

Synthetic (Not A Natural Rock)

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

Chert (often called Jasper or River Rock) (Chert (SiO2)) — sedimentary

Chert (often called Jasper or River Rock)

Chert (SiO2)

Shale (Fissile mudrock (composed of clay-sized particles and detrital grains)) — sedimentary

Shale

Fissile mudrock (composed of clay-sized particles and detrital grains)

Grey Granite (Phaneritic Felsic Intrusive Igneous Rock) — igneous

Grey Granite

Phaneritic Felsic Intrusive Igneous Rock

Sandstone (Cross-bedded Drill Core) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Cross-bedded Drill Core)

Clastic Sedimentary Rock (primarily SiO2)

Basalt (Water-worn Pebble) (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt (Water-worn Pebble)

Basalt (Mafic Extrusive Igneous Rock)

Coquina (Biogenic Limestone (CaCO3)) — sedimentary

Coquina

Biogenic Limestone (CaCO3)

Granite (Phaneritic Plutonic Felsic Rock) — igneous

Granite

Phaneritic Plutonic Felsic Rock

Granite (Phaneritic Igneous Rock (Granite)) — igneous

Granite

Phaneritic Igneous Rock (Granite)

Amethyst (Tumbled) (Amethyst (Silicon Dioxide, SiO2 + Fe4+)) — mineral

Amethyst (Tumbled)

Amethyst (Silicon Dioxide, SiO2 + Fe4+)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Red Sandstone (Clastic sedimentary rock (primarily SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Sandstone (likely Fossiliferous) (Arenite / Fossiliferous Sandstone (SiO2 composition)) — sedimentary

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)

Glazed Ceramic Tile (Fused Silicate-Clay composite) — Synthetic (Man-made material mimicking natural stone)

Glazed Ceramic Tile

Fused Silicate-Clay composite

Synthetic (Man-made material mimicking natural stone)

Red Tiger's Eye (Silicified Crocidolite (Quartz pseudo-morph after Crocidolite), SiO2) — metamorphic

Red Tiger's Eye

Silicified Crocidolite (Quartz pseudo-morph after Crocidolite), SiO2

Dyed Purple Agate (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — mineral

Dyed Purple Agate

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Granite (Granite (Felsic Plutonic Rock)) — igneous

Granite

Granite (Felsic Plutonic Rock)

Amethyst (Agate/Chalcedony variety) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst (Agate/Chalcedony variety)

Silicon Dioxide (SiO2) with iron impurities

Concrete Fragment (Hardened Portland Cement Composite) — Anthropogenic (Man-made material mimicking sedimentary rock)

Concrete Fragment

Hardened Portland Cement Composite

Anthropogenic (Man-made material mimicking sedimentary rock)

Herkimer Diamond (Quartz (Silicon Dioxide, SiO2)) — mineral

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Ferruginous Sandstone (Ironstone Nodules) (Ferruginous Quartz-Arenite (with Goethite/Hematite cement)) — sedimentary

Ferruginous Sandstone (Ironstone Nodules)

Ferruginous Quartz-Arenite (with Goethite/Hematite cement)

Yellow Quartz (Citrine or Iron-stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Amethyst Lace Agate / Banded Amethyst (Silicon Dioxide (SiO2) with Fe3+ impurities) — mineral

Amethyst Lace Agate / Banded Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

Shale (sub-type: Carbonaceous Shale) (Lutaceous Sedimentary Rock) — sedimentary

Shale (sub-type: Carbonaceous Shale)

Lutaceous Sedimentary Rock

Chert Conglomerate (or Breccia) (Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)) — sedimentary

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

Conglomerate (Clastic sedimentary rock (Puddingstone)) — sedimentary

Conglomerate

Clastic sedimentary rock (Puddingstone)

Sandstone (specifically Arkose or Quartz Arenite) (Arenite (primarily SiO2 with possible Feldspar)) — sedimentary

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Sandstone (Quartzose type) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose type)

Arenite (primarily SiO2)

Yellow Quartz (Chalcedony) (Quartz / Chalcedony (Silicon Dioxide, SiO2)) — mineral

Yellow Quartz (Chalcedony)

Quartz / Chalcedony (Silicon Dioxide, SiO2)

Sandstone (likely Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (likely Quartzose)

Arenite (primarily SiO2)

Smoky Quartz on Feldspar (Granite Pegmatite) (Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)) — igneous

Smoky Quartz on Feldspar (Granite Pegmatite)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Blue Dyed Agate (Silicon Dioxide (SiO2)) — mineral

Blue Dyed Agate

Silicon Dioxide (SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate) (N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)) — Organic (if resin) or Synthetic (if glass); simulating Sedimentary or Metamorphic (for natural stones)

Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)

N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)

Organic (if resin) or Synthetic (if glass); simulating Sedimentary or Metamorphic (for natural stones)

Pink Granite (Phaneritic Felsic Igneous Rock) — igneous

Pink Granite

Phaneritic Felsic Igneous Rock

Boulder Opal (Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)) — Mineral

Boulder Opal

Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)

Sandstone Beach Pebble (Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)) — sedimentary

Sandstone Beach Pebble

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)

Jasper in Quartz (River Cobble) (Silicon Dioxide (SiO2) with Ferric Iron inclusions) — sedimentary

Jasper in Quartz (River Cobble)

Silicon Dioxide (SiO2) with Ferric Iron inclusions

Amethyst (SiO2 (Silicon Dioxide)) — mineral

Amethyst

SiO2 (Silicon Dioxide)

Amethyst (Silicon Dioxide (SiO2) with trace Iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with trace Iron impurities

Synthetic Resin Charm (Seal Shape) (Polymer Resin with plastic glitter / Polyethylene terephthalate glitters) — Synthetic material (Not a rock or mineral)

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Synthetic material (Not a rock or mineral)

Chert Concretion (with typical hematite/limonite staining) (Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)) — sedimentary

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Kimberlite (Kimberlite (Potassic ultramafic igneous rock)) — igneous

Kimberlite

Kimberlite (Potassic ultramafic igneous rock)