Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Category
Man Made Material
Browse man made material specimens identified by the Rock Identifier community.
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Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Sandstone
Arenite (SiO2 primarily)
sedimentary
Jasper (Iron-rich Chalcedony)
Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)
Sedimentary / Metamorphic
Sandstone
Arenite
sedimentary
Fossilized Shark Tooth (Eroded)
Carcharodon sp. or Otodus sp. fragment (likely)
fossil
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Dragon Vein Agate (Dyed/Treated)
Agate (SiO2)
mineral
Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
sedimentary
Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Antropogenic (Man-made industrial byproduct)
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Chert / Green Jasper
Silicon Dioxide (SiO2)
sedimentary
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Blue glass-like tumbled specimen
Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image
mineral
Sand Tiger Shark Tooth (Fossil)
Carcharias taurus (fossilized dentin/enameloid)
fossil
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Engineered Quartz (Quartzite look-alike)
Silicon Dioxide (SiO2) composite
mineral-based composite
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead Shard)
Microcrystalline silica (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Flint (or Chert with cortex)
Silicon dioxide (SiO2)
sedimentary
Chert (varieties include Flint and Mudstone)
Microcrystalline Silica (SiO2)
sedimentary
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Chert (Chocolate or Brown Flint)
Chert (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
sedimentary