Man Made Material (Constructed)

Flint

Silicon dioxide (SiO2)

Chert

Microcrystalline Silicon Dioxide (SiO2)

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon dioxide (SiO2)

Turquoise bead bracelet

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

Diamond

Carbon (C)

Diamond (in a jewelry setting)

Diamond (Carbon, C)

Chert / Flint

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (SiO2)

Probable amber fragment

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

Chert Nodule

Microcrystalline Quartz

Chert (often called Flint or Jasper if reddish)

Microcrystalline Quartz (SiO2)

Coquina

Coquina (Biogenic Limestone / CaCO3)

Tektite

Natural impact glass

Multicolored beryl gemstone bracelet

Beryl, Be₃Al₂Si₆O₁₈; likely mixed aquamarine, morganite, heliodor, and green beryl beads

Synthetic Faux Fur Fursuit

Polyacrylonitrile / Polyester (Synthetic Textile)

Tumbled yellow jasper or chalcedony

Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony

Malaysian 50 Sen Coin

Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)

Sandstone

Arenite (specifically sublithic or quartz arenite)

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Sand Tiger Shark Tooth (Fossil)

Carcharias taurus (fossilized dentin/enameloid)

Carnelian cabochon pendant

Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)

Terrazzo (Synthetic Composite Rock)

Cementitious or Epoxy Resin-bound Aggregates

Carved serpentine pendant

Serpentine-group minerals, commonly antigorite/lizardite (Mg₃Si₂O₅(OH)₄), possibly mixed with chlorite or other inclusions

Weathered fossil shell fragment

Indeterminate bioclastic carbonate, likely molluscan shell (calcium carbonate, commonly aragonite or calcite)

Amethyst crystal fragment

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron and irradiation

Fossil shark tooth in sediment

Likely fossilized shark tooth, possibly *Carcharhinus* or *Otodus*; exact identification requires the tooth’s full morphology and locality

Beaded gemstone bracelet, likely lapis lazuli and pale quartz/agate

Lapis lazuli: lazurite-rich rock, chiefly (Na,Ca)₈(AlSiO₄)₆(S,SO)₂; pale beads are uncertain

Unidentified polished dark gemstone cabochon

Possibly hematite, obsidian, jet, or dark agate; image insufficient for a definitive identification

Limestone

Calcareous sedimentary rock (CaCO3)

Jade bangle

Likely nephrite jade (actinolite–tremolite amphibole); possibly jadeite

White Marble

Calcite-rich Metasomatized Carbonate (CaCO3)

Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)

Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)

Diamond (in jewelry setting)

Adamantine Carbon (C)

Chert (Flint)

Microcrystalline Silica (SiO2)

River Pebbles (Chert and Quartzite)

Sedimentary Clastic Rock (Silica-rich)

Blue faceted gemstone, likely synthetic sapphire or blue glass

Corundum (Al₂O₃) if sapphire; identity cannot be confirmed visually

Sandstone

Arenite

Coquina

Bioclastic Limestone

Blue glassy mineral fragment, possibly sodalite or dyed/cobalt glass

Uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) if natural, but vivid blue color may indicate cobalt-colored glass

Yellow chalcedony (likely lemon agate or yellow jasper)

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

Chert (Flint Arrowhead)

Silicon Dioxide (SiO2)