Mosasaur Tooth Fossil
Mosasauridae (likely Prognathodon or Plioplatecarpus)
fossil
Category
Sedimentary (Base), Then Artificial
Browse sedimentary (base), then artificial specimens identified by the Rock Identifier community.
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Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Mica (Muscovite or Biotite)
Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)
mineral
Chert (with Quartz Veining)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz / Common Gravel
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Calcareous or Quartz-rich)
Arenite (SiO2 based typically)
sedimentary
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Bloodstone
Chalcedony (Variety: Bloodstone / Heliotrope), SiO2
mineral
Chert (Field Stone/Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Gneiss (Metamorphic Pebble)
Metamorphic Rock (Quartz-Feldspar-Biotite Gneiss)
metamorphic
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Limestone (Weathered Aggregate)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Limestone (Weathered / Limonite-stained)
Sedimentary carbonate rock (CaCO3)
sedimentary
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Clastic Sedimentary Conglomerate (SiO2 primarily)
sedimentary
Banded River Stone (Greywacke or Siltstone subtype)
Sedimentary Banded Siltstone
sedimentary
Conglomerate
Clastic Sedimentary Rock
sedimentary
Conglomerate (or Breccia)
Clastic Sedimentary Rock
sedimentary
Sandstone (likely Graywacke or Lithic Sandstone)
Clastic Sedimentary Rock
sedimentary
Gneiss
Gneiss (High-Grade Metamorphic Rock)
metamorphic
Chert (often colloquially called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert Concretion with Iron Oxide Staining
Microcrystalline Quartz (SiO2)
sedimentary
Schalenblende
Sphalerite with Wurtzite, Galena, and Marcasite/Pyrite
mineral
Sandstone
Arenite (SiO2 based typically)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Siltstone
Siltstone (primarily SiO2, Al2O3)
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Fossiliferous Limestone
Carbonate sedimentary rock (CaCO3) with bioclasts
sedimentary
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Quartzite with Mica / Gneiss Pebble
Metamorphic Rock (Quartz-Feldspar-Mica aggregate)
metamorphic
Gneiss
Granitic Gneiss
metamorphic
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Mica
Mica group (often Muscovite or Biotite)
mineral
Dyed blue howlite (turquoise imitation), possibly dyed magnesite
Howlite: Ca₂B₅SiO₉(OH)₅; the vivid blue color is artificial dye. Exact identification is uncertain from the photograph alone.
gemstone
Blue Kyanite in Schist
Al2SiO5 in Mica Schist
metamorphic
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Shale with Quartz Veins
Fissile Sedimentary Rock (SiO2)
sedimentary