Metal Alloy

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.

Cubic Zirconia (CZ) in Gold-Plated Setting

Cubic Zirconium Dioxide (ZrO2)

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Note: Item is a Synthetic/Man-made Object

Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)

Titanium-coated Metal Cube (Man-made Fidget Toy)

Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)

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).

Chalcopyrite in Matrix

CuFeS2

Ferrosilicon Slag (Industrial Vitrified Glass)

Vitreous Silicate Residue

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Aquamarine

Beryl (Be3Al2Si6O18)

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy

Mineral Sand (Heavy Mineral Sand Concentrate)

Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite

Celestine (Celestite)

Celestine (Strontium Sulfate, SrSO4)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Blue Celestite

Celestine (Strontium Sulfate, SrSO4)

Celestine (Celestite)

Strontium sulfate (SrSO4)

US Penny

Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy

Malaysian 50 Sen Coin

Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Man-made Jewelry Charm (Enameled Metal)

Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.

Stainless Steel (Polished)

Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Diamond-set gold ring (stone identity uncertain)

Possible diamond (crystalline carbon, C); metal setting appears gold-colored

Pallasite Meteorite

Pallasite (ST-class)

Gold ring with a dark, possibly gemstone setting

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

Clear faceted gemstone in a gold-colored setting

Likely colorless quartz (rock crystal) or synthetic cubic zirconia; visual identification is inconclusive

Gold (10K Alloy)

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

Metal Chain Belt with Square Plates

Not applicable (man-made)

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Likely gold-colored metal ring with a possible gemstone

Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Zinc Alloy (Silver-plated)

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

Silver (Sterling Silver)

Argentum (Ag) mixed with Copper (Cu); Formula: Ag+Cu

Standing Liberty Quarter (Silver Specimen)

Native Silver alloy (Ag with Cu traces)

Man-made Blank Ammunition (Brass)

CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)

Iron meteorite fragment

Fe-Ni meteorite, likely an iron meteorite or stony-iron fragment

Copper

Native Copper (Cu)