Antropogenic (Man Made Material)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Banded Sandstone

Arenite with Liesegang banding

Lapis lazuli bead bracelet

Lapis lazuli, chiefly lazurite (Na₃Ca(Si₃Al₃)O₁₂S); commonly with calcite and pyrite

Tumbled orange chalcedony / jasper

Microcrystalline quartz, SiO₂, likely iron-stained chalcedony or quartz-rich jasper

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite

Chert (variations include Flint/Novaculite)

Chert (formula: SiO2)

Chert (often called Flint for darker varieties)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (and Jasper/Chalcedony mixture)

Microcrystalline Quartz (SiO2)

Banded Calcite (often commercially sold as 'Mexican Onyx' or 'Honey Onyx')

Calcite (Calcium Carbonate, CaCO3)

Dyed turquoise-colored lava stone beads

Vesicular basalt (scoria), commonly sold as dyed lava rock

Black tourmaline bead bracelet, possibly mixed with smoky quartz or brown tourmaline

Schorl tourmaline, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄; exact beads cannot be confirmed visually

Coal (Anthracite / Bituminous)

Organic Sedimentary Rock (Carbon-based)

Tree Agate

Chalcedony (SiO2)

Chert (Nodule)

Chert (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (and Flint)

Silicon Dioxide (SiO2)

Diorite

Intermediate plutonic igneous rock

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Likely weathered granite or granitic gneiss fragment

Granite; primarily quartz, feldspar, and mica

Diamond

Carbon (C)

Yellow Sapphire (Raw)

Corundum (Al2O3)

Likely flint (chert) fragment

Microcrystalline quartz (SiO₂), variety chert

Pearl

Pearl (Calcium Carbonate with organic conchiolin, CaCO3)

Amethyst and aquamarine gemstone bracelet

Amethyst: purple quartz, SiO₂; blue beads likely aquamarine/blue quartz, with possible metallic spacer beads

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Sea Glass

Amorphous Silicon Dioxide (SiO2)

Crackle Glass (Simulated Gemstone)

Amorphous Solid (SiO2)

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Porcelain (Stoneware Ceramic)

Mullite / Silica-glass composite (Al6Si2O13)

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Goldstone (Brown)

Aventurine glass

Polished garnet bead bracelet

Garnet group, likely almandine–pyrope solid solution; commonly approximated as Fe₃Al₂(SiO₄)₃–Mg₃Al₂(SiO₄)₃

Red-and-brown agate bead bracelet

Agate, a microcrystalline variety of quartz (SiO₂), likely colored chalcedony/carnelian

Rounded quartz pebble

Quartz (silicon dioxide, SiO₂)

Beaded gemstone jewelry, likely carnelian and green aventurine

Carnelian: orange chalcedony (microcrystalline SiO₂); green aventurine: quartz with fuchsite or other inclusions (SiO₂)

Blue-green gemstone ring, likely treated turquoise or synthetic/treated beryl

Indeterminate from image; possibilities include turquoise (CuAl6(PO4)4(OH)8·4H2O), apatite, or treated beryl

Granite

Phaneritic plutonic rock (SiO2 typically >69%)

Flaked stone projectile point

Likely worked chert or fine-grained silicified shale; exact lithology cannot be confirmed from the image

Chert (and Flint)

Silicon Dioxide (SiO2)