Anthropogenic Specimen (Man Made Material)

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Amethyst and aquamarine gemstone bracelet

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

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Chert / Flint

Silicon Dioxide (SiO2)

Diamond

Native Carbon (C)

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Tumbled greenstone / serpentinite (probable)

Serpentinite, chiefly Mg-rich serpentine minerals (antigorite, lizardite, chrysotile), possibly mixed with chlorite, magnetite, or carbonate

Carved red jasper bead (likely ceramic imitation)

Jasper, microcrystalline quartz (SiO₂); exact material uncertain from the image

Amber jewelry (possibly amber-colored glass or resin)

Amber — fossilized plant resin, chiefly composed of polymerized terpenoids; the pictured material cannot be confirmed from the image

Diamond

Carbon (C)

Tumbled chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Chert (Flint)

Silicon Dioxide (SiO2)

Chert

Chert (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow faceted gemstone, likely citrine or yellow sapphire

Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)

Chert

Microcrystalline silica (SiO2)

Tumbled cream-colored pebble

Likely quartz-rich sandstone or limestone; exact identification requires testing

Tumbled iron-rich stone, likely hematite-bearing jasper

Jasper (microcrystalline quartz, SiO₂) with iron oxides, chiefly hematite/goethite

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Chert Arrowhead (Lithic Artifact)

Chert (Cryptocrystalline Quartz, SiO2)

Tiger Shark Fossil Tooth

Galeocerdo cuvier (fossilized)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Nephrite Jade

Nephrite

Corundum (Sapphire/Ruby in Matrix)

Corundum (Al2O3)

Chert (Flint)

Silicon Dioxide (SiO2)

Blue chalcedony cabochon (likely)

Chalcedony, microcrystalline SiO₂; possibly blue agate or common opal, which cannot be distinguished confidently from the image

Goldstone (blue/black aventurine glass)

Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Iron Slag

Anthropogenic Iron oxide/Silicate composite

Porous limestone (likely fossiliferous or weathered limestone)

Calcite-rich limestone; chiefly calcium carbonate (CaCO₃)

Chert (specifically Flint or Common Chert node)

Silicon Dioxide (SiO2)

Orange glassy slag (industrial by-product)

Iron-rich silicate glass; composition varies, commonly Fe–Ca–Al silicate

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Diamond

Carbon (C)

Chert (Siltstone / Flint)

SiO2 (Cryptocrystalline Quartz)

Chert (specifically Flint or Nodular Chert)

Silicon dioxide (SiO2)

Chert (Flint)

SiO2 (Microcrystalline Quartz)

Granodiorite / Granite (Weathered)

Granodiorite

Chert (and Agate/Chalcedony)

Microcrystalline Quartz (SiO2)

Granite Pebble

Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)

Brown chert (flint)

Microcrystalline quartz (SiO₂), varieties called chert or flint

Chalcedony (likely agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony