Man Made Material (Constructed)

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (varietal Chalcedony or Flint)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Chert (Flint)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (SiO2 based clastic rock)

Chalk

Calcium carbonate (CaCO3)

Slag (Industrial Glass/Metal)

Ferrous slag or Glassy silicate byproduct

Sandstone

Arenite (primarily SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Goldstone

N/A (Synthetic Glass with Copper Inclusions)

Sandstone

Arenite (composed primarily of SiO2)

Dragon Vein Agate (Dyed/Treated)

Agate (SiO2)

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Pale green aventurine (likely quartz) sphere

Quartz, SiO₂; possibly pale green aventurine, with color from inclusions or treatment

Likely tumbled epidote-bearing rock or green jasper

Epidote-group silicate, possibly in a jasper or serpentinite matrix

Chalcedony (Agate / Jasper Specimen)

Silicon Dioxide (SiO2)

Heart-shaped faceted gemstone pendant

Likely yellow quartz (citrine) or synthetic yellow stone, set in metal with small clear accent stones

Green-and-white terrazzo (likely serpentine/marble aggregate)

Composite decorative stone; probable serpentinite (Mg₃Si₂O₅(OH)₄) with white calcite marble fragments in cementitious matrix

Pumice or vesicular volcanic tuff

Pumice: highly vesicular volcanic glass, chiefly rhyolitic to dacitic; possible tuff: lithified ash and pumice fragments

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Coquina / Fossiliferous Limestone

Calcareous bioclastic sedimentary rock (CaCO3)

Sandstone (with iron staining)

Quartz Arenite / Ferruginous Sandstone

Unknown dark mineral/rock fragment

Indeterminate; possibly a dark sulfide mineral or slag-like geological fragment

Banded agate cabochon

Microcrystalline quartz (chalcedony), SiO₂

Turquoise cabochon ring

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Sandstone

Clastic sedimentary rock (Quartz arenite/Arkose)

Polished greenstone pebble

Likely nephrite jade (tremolite–actinolite), though serpentine or greenstone is possible from appearance alone

Fossilized Shark Tooth (Eroded)

Carcharodon sp. or Otodus sp. fragment (likely)

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Sandstone

Sedimentary Rock (Quartz arenite)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sandstone (likely Quartzose Sandstone)

Arenite

Conglomeratic concrete or asphalt aggregate surface with dark bituminous chunks

Polymictic gravel aggregate; dark pieces likely bitumen/asphalt, not a natural rock

Chert (with nodule)

Microcrystalline Quartz (SiO2)

Iron-stained quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Aquamarine-like beryl pendant

Beryl, Be₃Al₂Si₆O₁₈; the beads may be dyed or treated chalcedony/amazonite, so image-only identification is uncertain

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Diamond

Carbon (C)

Polished black stone pendant

Likely black obsidian or black tourmaline; exact identification is uncertain from the photograph

Jasper (Iron-rich Chalcedony)

Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)

Weathered chert or chalcedony nodule

Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony

Turquoise-style beaded bracelet

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads

Chert / Flint

Silicon Dioxide (SiO2)