Man Made Material (Simulated Mineral)

Tumbled milky chalcedony (likely common opal or quartz-rich chalcedony)

Chalcedony, microcrystalline SiO₂; identification is uncertain from the photo

Greenstone pebble

Greenstone (metamorphosed mafic rock, commonly altered basalt); exact identification requires testing

Chalcedony (likely blue agate) knapped into an arrowhead

Microcrystalline quartz, SiO₂ (chalcedony)

Red Cubic Zirconia (Simulated Garnet)

Zirconium Dioxide (ZrO2)

Diamond

Diamond (pure Carbon, C)

Diamond

Carbon (C)

Tiger Shark Fossil Tooth

Galeocerdo cuvier (fossilized)

Gold ring with a dark, possibly gemstone setting

Gold alloy; the dark setting is not identifiable from the image

Faience and Carnelian in Egyptian Revival Jewelry

Faience (quartz frit) and Carnelian (chalcedony, SiO2)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Tumbled sea glass or pale-green quartz pebble

Indeterminate from image; possibly quartz (SiO₂), but the smooth translucent piece may be man-made glass

Amber (Simulated/Faturan Style)

Resin mix (Likely Phenolic/Celluloid if synthetic, Succinite if natural)

Yellow faceted gemstone, likely citrine or synthetic glass

Citrine (quartz, SiO₂) is the leading natural possibility; visual identification is uncertain from the photograph

Chert (possibly a worked stone flake)

Microcrystalline quartz, SiO₂

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

Diamond

Carbon (C)

Diamond

Carbon (C)

Onyx (Black) and Mother of Pearl Inlay

Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl

Diamond (as set in a gold ring)

Carbon (C)

Trilobite fossil

Trilobita (exact species indeterminable from the image)

Faceted clear gemstone ring, likely quartz or glass imitation

Unidentified colorless faceted material; quartz (SiO₂) is possible, but the image cannot distinguish it from glass or another gem

Sandstone

Sedimentary Rock (Quartz Sandstone)

Clear crystal-bead bracelet, possibly quartz

Unidentified transparent mineral beads; quartz (SiO₂) is one possibility

Flint (chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Asphalt Concrete

Bituminous Concrete / Asphaltic Composite

Tumbled quartzite pebble (likely)

Quartz-rich quartzite; mainly SiO₂

Rough Diamond

Pure Carbon (C)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Note: Item is a Synthetic/Man-made Object

Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)

Pearl necklace

Pearl, primarily aragonite (CaCO₃) and conchiolin

Yellow chalcedony (possibly iron-stained agate)

Microcrystalline quartz, SiO₂

Tumbled amethyst quartz

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

Likely beach-worn glass and a pebble

The brown piece appears to be weathered glass (amorphous SiO₂-rich material); the pale piece is likely a small quartz-rich stone, possibly milky quartz.

Green jasper (possibly dyed or coated)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

Tourmalinated quartz point

Quartz (SiO₂) containing black tourmaline, usually schorl (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Chert (Flint)

Silicon dioxide (SiO2)

Sandstone

Sandstone (Quartz-rich Arenite / SiO2)

Chert (flint), brown variety

Microcrystalline quartz (SiO₂)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Blue-green chrysocolla rough specimen

Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite

Polished/tumbled brown-and-white mineral fragment

Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral

Jasper / Chert (Red)

Cryptocrystalline quartz (SiO2)