Antropogenic (Man Made Material)

Chert Arrowhead

Chert (Cryptocrystalline variety of Quartz, SiO2)

Raw Diamond

Carbon (C)

Chert (Common Opal/Jasper variety)

Cryptocrystalline Quartz (SiO2)

Chert (and/or Flint)

Microcrystalline Quartz (SiO2)

Diamond (in jewelry setting)

Carbon (C)

Tumbled chalcedony or quartz pebble

Microcrystalline quartz, SiO₂ (likely chalcedony); exact identification is uncertain from the image

Polished brecciated jasper pendant

Jasper, an opaque microcrystalline variety of chalcedony (mostly SiO₂), with iron-oxide staining and likely brecciation

Sandstone

Clastic sedimentary rock (primarily SiO2)

Goldstone (Synthetic Aventurescence Glass)

Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)

Decorated turquoise-like bead or mineral pendant

Likely turquoise [CuAl₆(PO₄)₄(OH)₈·4H₂O], possibly dyed composite or blue-green jasper

Pink Granite

Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (SiO2)

Chert (Green Chert or Jasper)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

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)

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)

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)

Asphalt Chunk (with aggregate)

Bituminous concrete / Anthropogenic conglomerate