Mineral Based Composite

Heat-Treated Citrine (Amethyst-based)

Quartz (Silicon Dioxide) - SiO2

Gold Ore

Native Gold (Au)

Gold Flake

Native Gold (Au)

Diamond

Carbon (C)

Gold flakes

Native Gold (Au)

Gold

Native Gold (Au)

Gold-bearing quartz vein in dark host rock

Native gold (Au) with quartz (SiO₂), likely in slate, schist, or altered volcanic rock

Native Gold Nuggets

Native Gold (Au)

Granite

Granite (a plutonic igneous rock)

Amethyst

SiO2 (Silicon Dioxide)

Asphalt (Bituminous Concrete)

Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)

Gold Nugget

Native Gold (Au)

Opalite

Synthetic Opalised Glass

Weathered iron-rich rock fragment

Likely limonite/goethite-bearing rock, possibly altered pyrite or mica schist

Quartz

Quartz (SiO2 - Silicon Dioxide)

Opal

Hydrated silica (SiO2·nH2O)

Gold Nugget

Native Gold (Au)

Orange Tabby (Felis catus)

Felis silvestris catus (variety: Red Mackerel Tabby)

Turquoise-style beaded bracelet

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads

Fossil Shark Tooth

Odontaspididae (Sand Tiger Shark family)

Gold-bearing quartz sulfide specimen

Native gold (Au) with quartz (SiO₂), likely associated with iron sulfides such as pyrite

Native Gold

Native Gold (Au)

Gold

Native Gold (Au)

Native Silver

Silver (Ag)

Chert (Flint Pebbles)

Microcrystalline Quartz (SiO2)

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Mystic Topaz (Treated Quartz or Topaz)

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating

Sapphire

Corundum (Al2O3)

Crinoid stem fossil

Crinoidea

Botryoidal quartz geode

Quartz (SiO₂), likely a chalcedony-lined geode with drusy quartz crystals

Granite

Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Tumbled Stone

Silicon dioxide / Various silicates

Gold Nugget

Native Gold (Au)

Fossilized Shark Tooth

Chondrichthyes (Class)

Carved Mottled Greenish-Yellow Crystal/Glass Object

Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.

K2 Stone (or K2 Jasper)

Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)

Asphalt Chunk

Asphalt concrete

Polished turquoise cabochon jewelry (likely composite or stabilized turquoise)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O

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

Banded calcite; predominantly CaCO₃, usually microcrystalline to fibrous calcite