Metal (Elemental Mineral)

Bismuth Crystal

Bismuth (Bi)

Blue slag glass / industrial smelter slag

Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases

Yellow Beryl

Beryl (Be3Al2(SiO3)6)

Copper Ore with Chalcocite

Copper sulfide (Cu2S) with associated copper-bearing minerals

Chalcopyrite (or Pyrite Ore)

CuFeS2 (Copper Iron Sulfide)

Lepidolite with Rubellite Tourmaline

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

Orgonite Pyramid (containing Amethyst and mixed minerals)

Silicon Dioxide (SiO2) in synthetic resin

Unidentified metallic mineral or metal-like specimen

Indeterminate from image; possibly galena (PbS) or a metallic sulfide

Bismuth

Bismuth (Bi)

Mineral Sand (Heavy Mineral Sand Concentrate)

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

Granite

Intrusive Igneous Rock

Lepidolite

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

Industrial slag (iron/copper smelting slag)

Multiphase vitreous metallurgical slag; commonly iron-silicate glass with metal-oxide and metallic inclusions

Pyrite

Iron Disulfide (FeS2)

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Opalite

Synthetic Opalized Glass / Man-made Glass

Native Copper with Cuprite and Quartz

Copper (Cu), Cuprite (Cu2O), Quartz (SiO2)

Silver (Sterling Silver)

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

Diamond (in jewelry)

Carbon (C)

Silicon

Crystalline Silicon (Si)

Fluorite

Calcium Fluoride (CaF2)

Rhyolite

Extrusive igneous rock (felsic)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Gold Ore (Auriferous Quartz with Chalcopyrite/Pyrite)

Au (Native Gold) in Quartz (SiO2) with FeS2 (Pyrite) or CuFeS2 (Chalcopyrite)

Lepidolite

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

Small brown mineral/rock fragment

Indeterminate; possibly weathered quartz-rich rock, ironstone, or a sulfide mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Beryl (likely Aquamarine or Green Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

Slag Glass

Silicon dioxide with impurities

Quartz Vein in Host Rock (Gneiss/Schist)

Silicon Dioxide (SiO2) within a metamorphic matrix

Tumbled hematite

Hematite (Fe₂O₃), likely polished specular hematite

Quartz-bearing Pegmatite with Metallic Sulfides

Pegmatite / Quartz-Feldspar Matrix with Pyrite and Mica

Gossan (with Limonite and Hematite)

Gossanous iron-oxide rock (Fe2O3 · nH2O)

Clear faceted gemstone in a metal jewelry setting (likely imitation glass or cubic zirconia)

Unidentified transparent faceted stone; possibly cubic zirconia (ZrO₂) or glass

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).

Green Fluorite

Calcium Fluoride (CaF2)

Bauxite

Bauxite (mixture of Hydrous Aluminum Oxides)

Native Copper

Native Copper (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.

Opalite

Synthetic Glass / Man-made Opal Simulant

Pyrite

Iron Sulfide (FeS2)

Bismuthinite with Chalcopyrite and Quartz

Bismuthinite (Bi2S3) and Chalcopyrite (CuFeS2)