Belemnoit (Fossil)
Belemnoidea (Order), Rostrum / Guard
sedimentary
Category
Man Made Rock (Technosol)
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
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Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Green glassy slag (often sold as “sea glass” or “green obsidian”)
Industrial vitreous slag; primarily amorphous silicate glass, composition variable
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Slate
Metamorphic Pelitic Rock
metamorphic
Slate
Metamorphic Pelitic Rock
metamorphic
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Granite
Phaneritic plutonic felsic rock
igneous
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Small clear crystal, possibly quartz or glass-like gemstone
Uncertain; likely quartz (SiO₂), but the image is insufficient to exclude man-made glass or cubic zirconia
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite
Phaneritic Plutonic Felsic Rock
igneous
Granite
Granite (Phaneritic igneous rock)
igneous
Yellow cabochon gemstone, likely citrine or yellow glass imitation
Quartz (SiO₂), if natural citrine; visual evidence is insufficient to exclude man-made glass or resin
gemstone
Polished green-and-black banded cabochon (likely malachite imitation or dyed agate)
Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass
gemstone
Polished blue-green glassy slag or coated mineral fragment
Most likely man-made colored glass/slag; exact composition cannot be determined visually
mineral
Granite
Intrusive Igneous Rock (Granitic)
igneous
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Fossil Coral
Scleractinia (Stony Coral) fossil
fossil
Sandstone
Arenite (mostly SiO2)
sedimentary
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Chert (Flint / Quartz Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
gemstone
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Sandstone Pebble
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Unidentified gray metallic object
Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material
mineral
Colorless faceted gemstone, likely glass or cubic zirconia
Uncertain; possible cubic zirconia (ZrO₂) or quartz (SiO₂), but the image may show a man-made simulant
gemstone
Colorless faceted quartz-like gemstone
Likely quartz (SiO₂), though the appearance may also indicate man-made glass or cubic zirconia
gemstone
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous