Not A Rock (Man Made Polymer)

Sandstone

Arenite

Weathered granitic rock fragment

Granite, likely quartz–feldspar–biotite aggregate

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Lapis Lazuli

Lapis lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Chert (White Chert/Flint)

Microcrystalline Quartz (SiO2)

Polished stone sphere, possibly agate or jasper

Likely microcrystalline quartz (SiO₂); exact variety cannot be confirmed from the image

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Belemnoit (Fossil)

Belemnoidea (Order), Rostrum / Guard

Green glassy slag (often sold as “sea glass” or “green obsidian”)

Industrial vitreous slag; primarily amorphous silicate glass, composition variable

Pink granite

Granitic rock, chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

Sandstone

Arenite (primarily SiO2)

Slate

Metamorphic Pelitic Rock

Slate

Metamorphic Pelitic Rock

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Bornite (“peacock ore”), likely weathered copper sulfide

Bornite, Cu₅FeS₄; possibly chalcopyrite, CuFeS₂, with iridescent tarnish

Granite

Phaneritic plutonic felsic rock

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

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

Sandstone

Arenite (composed primarily of SiO2)

Amber

Succinite

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Sandstone

Clastic Sedimentary Rock

Granite

Phaneritic Plutonic Felsic Rock

Granite

Granite (Phaneritic igneous rock)

Lapis Lazuli (Tumbled)

Lazurite-dominated contact metamorphic rock

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

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

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Granite

Intrusive Igneous Rock (Granitic)

Bauxite

Bauxite (principal ore of aluminum, primarily Al(OH)3)

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Lapis Lazuli

Na8[Al6Si6O24]Sn (Lazurite-rich metamorphic rock)

Lapis Lazuli

Lazurite-dominant Metamorphic Rock (complex aluminosilicate)

Fossil Coral

Scleractinia (Stony Coral) fossil

Weathered granite or granitic gneiss pebble

Granite: quartz + feldspar + mica; possibly weakly foliated gneiss

Sandstone

Arenite (mostly SiO2)

Quartzite

Metamorphic Quartz Rock (SiO2)

Sandstone

Clastic Sedimentary Rock

Sandstone

Arenite (composed primarily of SiO2)

Jet

Lignite coal variant (hydrocarbon polymer)