Anthropogenic Specimen (Man Made Material)

Faceted Glass (Costume Jewelry)

Amorphous Silicon Dioxide with colorants (Glass)

Coquina

Bioclastic Limestone

Diamond (in a jewelry setting)

Carbon (C)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

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

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

Yellow chalcedony (likely lemon agate or yellow jasper)

Microcrystalline quartz, SiO₂; possibly iron-bearing jasper or chrysoprase-like chalcedony

Sandstone (Red/Brown Variety)

Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)

Slate

Metamorphic Pelitic Rock

Diamond

Carbon (C)

Tumbled purple quartz, likely amethyst or lavender quartz

Quartz (SiO₂), probably iron-colored amethyst; exact variety uncertain from the image

Possible ironstone concretion or weathered mineral nodule

Iron-oxide-rich concretion, likely goethite/limonite; identification uncertain from the photo

Rounded quartz pebble

Quartz (silicon dioxide, SiO₂)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Likely weathered granite or granitic gneiss fragment

Granite; primarily quartz, feldspar, and mica

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Blue Goldstone

Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)

Chert (Nodule)

Chert (SiO2)

Chert (Arrowhead/Projectile Point)

Chert (Cryptocrystalline Quartz, SiO2)

Obsidian Arrowhead

Obsidian (Volcanic Glass)

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Diamond

Native Carbon (C)

Megalodon Shark Tooth

Otodus megalodon

Carved quartz (likely rose quartz and green aventurine/quartz)

Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine

Iron Slag

Ferrous Slag (Industrial Byproduct)

Vesicular basalt (likely scoria)

Basaltic scoria; predominantly plagioclase, pyroxene, and olivine in a mafic volcanic glass/microcrystalline matrix

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Ferruginous Slag (Iron Smelting Byproduct)

Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)

Dark gneiss or migmatitic amphibolite

Band ed gneiss; composition likely quartz–feldspar–biotite/amphibole, possibly migmatite

Moissanite

Silicon Carbide (SiC)

Blue opalite (often sold as synthetic opal)

Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

Loose faceted colorless gemstones, likely quartz or glass-like mineral chips

Most consistent with quartz (SiO₂), though the photograph cannot exclude synthetic cubic zirconia or glass

Chert (White Chert/Flint)

Microcrystalline Quartz (SiO2)

Yellow Chert (Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Grooved Maun Ball (Maul/Hammerstone-like Concretion)

Calcareous/Ferruginous Concretion in Sandstone Matrix

Carved smoky quartz (likely)

Quartz, silicon dioxide (SiO₂), smoky variety

Slag

Anthropogenic Iron Silicate Glass

Diamond (in a jewelry setting)

Carbon (C)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)