Mineral (Refined Metal)

Zinc Alloy (Silver-plated)

Zinc Alloy Casting (Zn-Al-Mg-Cu)

Silver (Native Element)

Ag (Argentum) - 90% Silver, 10% Copper alloy in specimen

Gold ring with a dark, possibly gemstone setting

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

Bismuth crystal

Bismuth (Bi), commonly laboratory-grown

Copper Bullion Round

Native Copper (refined), Cu

Silver (Native Silver/Alloy Specimen)

Ag (Native Silver element), specifically a 90% Ag / 10% Cu alloy

Gold bullion bars

Native gold (Au), likely cast or refined metal

Gold and Silver (Metal Components of an Antique Pocket Watch)

Native Gold (Au) and Native Silver (Ag)

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

Copper

Native Copper (Cu)

Bismuth crystal

Bismuth (Bi), artificially crystallized

Bismuth crystal aggregate

Bismuth (Bi), commonly laboratory-grown

Silicon (Industrial Grade)

Elemental Silicon (Si)

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2)

Gold nugget or gold-bearing fragment

Native gold (Au), possibly gold-colored metal or coated material

Gold

Native Gold (Au)

Bauxite Ore

Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)

Metal Alloy (Likely Pewter or Sterling Silver)

Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).

Gold (Processed)

Gold (Au)

Gold

Aurum (Au)

Silver (Native Silver Mineral)

Ag (Native Silver), Alloyed 90% Ag / 10% Cu

Silicon

Element Si

Silver (Native Element)

Silver (Ag) in an alloy of 90% Silver and 10% Copper

Gem-set gold ring

Likely gold alloy set with a colorless gemstone, possibly diamond or clear quartz; the stone cannot be identified reliably from the image

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Iridescent bismuth crystal

Bismuth (Bi), artificially crystallized

Gold (10K Alloy)

Aurum (Au) with alloying metals (Cu, Ag, Zn)

Goldstone (Red)

Aventurine Glass (Cupriferous glass)

Copper

Native Copper (Cu)

Beryl

Beryl (Be3Al2Si6O18)

Metal Chain Belt with Square Plates

Not applicable (man-made)

Copper Ore (Malachite and Azurite stained rock)

Copper-bearing rock with secondary copper carbonates

Ferruginous Sandstone (Gozzan)

Iron-rich clastic sedimentary rock with Limonite/Goethite

Pallasite Meteorite

Pallasite (ST-class)

Bismuth crystal

Bismuth (Bi), synthetic laboratory-grown crystal

Native gold nugget

Native gold (Au), possibly gold-bearing quartz or iron-oxide matrix

Likely small metallic meteorite fragments

Unclassified iron or stony-iron meteorite; mineralogy cannot be confirmed from the image

Native Copper

Native Copper (Cu)

Faceted brown gemstone pendant, likely smoky quartz or champagne topaz

Probably quartz (SiO₂), smoky variety; alternatively topaz (Al₂SiO₄(F,OH)₂)

Tiny metallic-looking mineral or rock fragment

Unidentifiable from the image; possibly a small metallic mineral grain

Ferruginous Quartz

SiO2 (Silicon Dioxide) with Iron Oxide inclusions (FeO(OH) / Fe2O3)

Copper Ore (Malachite, Azurite, and Chalcopyrite in Host Rock)

Copper-bearing polymetallic mineral aggregate (Cu-minerals)