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

Bismuth crystal

Bismuth (Bi), commonly laboratory-grown

Silver (Native Silver/Alloy Specimen)

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

Copper Bullion Round

Native Copper (refined), Cu

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.

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)

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)

Silicon

Element Si

Silver (Native Silver Mineral)

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

Silver (Native Element)

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

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Gold (10K Alloy)

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

Goldstone (Red)

Aventurine Glass (Cupriferous glass)

Copper

Native Copper (Cu)

Metal Chain Belt with Square Plates

Not applicable (man-made)

Bismuth crystal

Bismuth (Bi), synthetic laboratory-grown crystal

Native gold nugget

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

Ferruginous Sandstone (Gozzan)

Iron-rich clastic sedimentary rock with Limonite/Goethite

Copper Ore (Malachite and Azurite stained rock)

Copper-bearing rock with secondary copper carbonates

Pallasite Meteorite

Pallasite (ST-class)

Native Copper

Native Copper (Cu)

Likely small metallic meteorite fragments

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

Ferruginous Quartz

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

Faceted brown gemstone pendant, likely smoky quartz or champagne topaz

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

Iron (Hematite variety)

Iron (Fe) / Hematite (Fe2O3)

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

Copper-bearing polymetallic mineral aggregate (Cu-minerals)

Copper Ore (Chrysocolla/Malachite in host rock)

Hydrated copper phyllosilicate and copper carbonate hydroxide

Nugget of Native Silver

Native Silver (Ag)

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Copper Ore (Malachite and Azurite on Host Rock)

Cuprite, Malachite, and Azurite dissemination in gangue