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

Silver (Native Silver/Alloy Specimen)

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

Copper Bullion Round

Native Copper (refined), Cu

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)

Silicon (Industrial Grade)

Elemental Silicon (Si)

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2)

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)

Silicon

Element Si

Gold

Aurum (Au)

Silver (Native Element)

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

Silver (Native Silver Mineral)

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

Gold (10K Alloy)

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

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Goldstone (Red)

Aventurine Glass (Cupriferous glass)

Copper

Native Copper (Cu)

Metal Chain Belt with Square Plates

Not applicable (man-made)

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

Likely small metallic meteorite fragments

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

Native Copper

Native Copper (Cu)

Pallasite Meteorite

Pallasite (ST-class)

Ferruginous Quartz

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

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)

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Copper and Quartz beads

Native Copper (Cu) and Crystalline Quartz (SiO2)

Lepidolite in Quartz

K(Li,Al)3(Si,Al)4O10(F,OH)2 / SiO2

Copper Ore (Malachite and Azurite on Host Rock)

Cuprite, Malachite, and Azurite dissemination in gangue

Silver Nuggets (Natural or Cast)

Native Silver (Ag)

Gold (Elemental Metal)

Gold (Au)

Aura Quartz (Anomalously Coated Quartz)

Silicon Dioxide (SiO2) treated with vaporized metals

Aura Quartz (Cranberry or Magenta Aura Quartz)

Silicon dioxide coated with titanium/niobium (SiO2)

Native copper nugget

Copper (Cu), commonly with cuprite and copper-oxide alteration