Man Made Material (Jewelry, Metal Alloy)

Iron-rich meteorite candidate

Unclassified stony-iron or iron meteorite fragment

Chert / Flint

Silicon Dioxide (SiO2)

Diamond

Carbon (C)

Banded Calcite (often commercially sold as 'Mexican Onyx' or 'Honey Onyx')

Calcite (Calcium Carbonate, CaCO3)

Native Gold Nugget

Native Gold (Au)

Banded Calcite or Travertine

Calcium Carbonate (CaCO3)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Gold Nugget

Native Gold (Au)

Turquoise (likely stabilized or simulated Howlite)

CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)

Quartzite (River Pebble)

Quartzite (SiO2)

Chert Arrowhead (Lithic Tool)

Microcrystalline quartz (SiO2) - Archeological lithic artifact

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Rose Quartz

SiO2 (Crystalline Quartz with trace inclusions)

Fossilized oyster shell

Bivalvia; likely an oyster (Ostreidae), partly mineralized with calcite

Tree Agate

Chalcedony (SiO2) with Dendritic inclusions

Likely weathered iron-rich meteorite

Unclassified stony-iron or iron meteorite candidate; confirmation requires laboratory testing

Marble

Recrystallized Calcite (CaCO3)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Milky Quartz

Silicon Dioxide (SiO2)

Turquoise color-bead and Hematite necklace

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

Precious Coral (Red Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Aquamarine

Beryl (Be3Al2Si6O18)

Iron meteorite fragment (probable)

Fe–Ni metallic meteorite, commonly octahedrite (kamacite–taenite)

Sandstone

Arenite (siliciclastic sedimentary rock composed mostly of quartz)

Smoky Quartz

Silicon Dioxide (SiO₂)

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Aura Quartz (Titanium/Bismuth Coated)

Silicon Dioxide (SiO2) with metallic vapor coating

Aura Quartz (Coated Quartz)

Silicon Dioxide (SiO2) coated with vaporized metals

Seashell Fragment

Calcium carbonate (CaCO3) - primarily Aragonite or Calcite

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Gold

Native Gold (Au)

Gold

Native Gold (Au)

Gold

Native Gold (Au)

Black Onyx

Onyx (Silicon Dioxide, SiO2)

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)

Quartz (Milky or Iron-Stained)

Silicon Dioxide (SiO2)

Lepidolite in Quartz (Lithium-bearing Ore)

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) and Quartz (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Native Silver Nugget

Silver (Ag)

Diamond (in a cluster setting)

Crystallized Carbon (C)

Granite

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

Blue Sapphire and Diamond (Set in Metal)

Corundum (Al2O3) and Diamond (C)