Anthropogenic (Man Made Material Processed By Nature)

Chalcanthite (Likely Synthetic/Lab-Grown)

Hydrated copper(II) sulfate (CuSO4·5H2O)

Blue chalcedony cabochon (probable)

Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Fossil Shark Tooth

Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna

Polished amethyst-bearing quartz

Quartz, SiO₂; purple coloration from irradiation and trace iron

Green aventurine bead bracelet

Quartz (SiO₂), likely fuchsite-bearing aventurine

Diamond (as set in a gold ring)

Carbon (C)

Diamond

Carbon (C)

Chert / Flint

Microcrystalline Quartz (SiO2)

Polished banded calcite (often sold as “onyx marble” or Mexican onyx)

Banded calcite; predominantly CaCO₃, usually microcrystalline to fibrous calcite

Yellow faceted gemstone, likely citrine or yellow sapphire

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

Paper (Cellulose)

Cellulose (C6H10O5)n

Bismuth Crystal

Bismuth (element symbol Bi, atomic number 83)

Green Aura Quartz

Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)

Slate

Metamorphic Pelitic Rock

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert or Jasper

Microcrystalline Quartz (SiO2)

Carved Gemstone Mushroom

Quartz / Feldspar composite (Carved lapidary art)

Tumbled cream-colored pebble

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

Exposed aggregate concrete (stone-chip surface)

Portland-cement concrete containing natural aggregate; not a natural rock

Polished stromatolite (likely fossilized microbial mat)

Fossil stromatolite; chiefly microcrystalline quartz (SiO₂), commonly replacing carbonate

Inlaid stone ring (likely jasper or agate)

Likely microcrystalline quartz (chalcedony, SiO₂), possibly jasper, with decorative mineral inlays

Coquina

Coquina (Bioclastic Limestone)

Chert (Flint)

Silicon Dioxide (SiO2)

Limpets Shell / Fossil Specimen

Patellogastropoda (Class)

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Chert (varietal: Flint/Jasper)

Silicon Dioxide (SiO2)

Carved labradorite fish

Labradorite, calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)

Gold-bearing quartz or iron-stained quartzite

Quartz (SiO₂), possibly with native gold and iron oxides

Pink Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate

Rough Citrine Quartz

Citrine (Silicon Dioxide, SiO2 with iron impurities)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Dyed Agate

Silicon Dioxide with artificial pigment (SiO2)

Tumbled fossil shark tooth pendant

Likely fossilized shark tooth, possibly Otodus or Carcharhinus; exact species cannot be confirmed from the image

Small metallic-looking mineral/rock fragment

Indeterminate from image; possibly galena, hematite, or metallic slag

Diamond (Cut jewelry specimen)

Diamond (pure Carbon, C)

Gemstone ring (stones not reliably identifiable from the image)

Likely faceted yellow stones and clear stones set in a metal band; species and treatments are indeterminate visually

Tumbled serpentinite (serpentine stone)

Serpentinite, dominated by serpentine-group minerals (lizardite, chrysotile, antigorite), commonly with magnetite and chromite

Peacock ore (bornite/chalcopyrite), likely treated

Bornite, Cu₅FeS₄, and/or chalcopyrite, CuFeS₂

Sandstone

Arenite (composed primarily of Quartz, SiO2)

Gold Grain

Native Gold (Au)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)