Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Category
Sedimentary (Man Made)
Browse sedimentary (man made) specimens identified by the Rock Identifier community.
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Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Tumbled chert or jasper pebble
Microcrystalline quartz (SiO₂), likely chert/jasper
sedimentary
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
Polished brown chalcedony (likely carnelian or jasper)
Microcrystalline quartz, SiO₂; iron oxides produce the brown coloration
mineral
Chert (Cherty Shale / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation
Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Small metallic-looking mineral/rock fragment
Indeterminate from image; possibly galena, hematite, or metallic slag
mineral
Sandstone
Arenite
sedimentary
Fossilized gastropod (likely nerite or related sea snail)
Gastropoda; shell composed originally of aragonite/calcite, commonly replaced or infilled by calcite
fossil
Blue glassy cabochon, likely blue quartz or synthetic glass
Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive
gemstone
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Sandstone
Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)
sedimentary
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Unidentified gray stone/concrete-like fragment
Indeterminate; likely a fine-grained carbonate or cementitious geological fragment
sedimentary
Asphalt aggregate (crushed stone in bitumen)
Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen
sedimentary
Concrete or asphalt-like aggregate surface with a dark fragment
Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock
sedimentary
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Polished/tumbled brown-and-white mineral fragment
Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral
mineral
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
mineral (synthetic)
Fossil Sea Urchin (Echinoid)
Echinoidea fossil (often replaced by silica or calcite)
fossil
Sandstone
Arenite
sedimentary
Sandstone (Pebble)
Arenite
sedimentary
Chert (Flint / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral