Mineral (Processed Alloy)

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Blue Onyx (Dyed Agate/Chalky Chalcedony)

Silicon Dioxide (SiO2) with artificial pigment

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Copper-bearing rock, likely native copper in a matrix

Native copper (Cu), possibly with cuprite/malachite in a basaltic or porphyritic matrix

Celestine (Celestite)

Celestine (Strontium Sulfate, SrSO4)

Lepidolite in Quartz Matrix

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

Copper Ore

Mixed copper sulfides/oxides in gangue matrix

Likely tumbled pale-green mineral specimen

Indeterminate; possibly serpentine, calcite, or pale jade/nephrite

Milky quartz with iron staining

Quartz (silicon dioxide, SiO₂), likely massive or vein quartz

Diamond in Gold Setting

Diamond (C - pure carbon)

Milky quartz fragment

Quartz, silicon dioxide (SiO₂)

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Heat-Treated Citrine (Amethyst-based)

Quartz (Silicon Dioxide) - SiO2

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Bornite (Peacock Ore) / Acid-treated Chalcopyrite

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2)

Dyed, polished stone beads (likely assorted agate or jasper)

Microcrystalline quartz, SiO₂ (chalcedony; exact stones cannot be determined from the image)

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

Chalcedony (Yellow Agate)

Cryptocrystalline Quartz (SiO2)

Green aventurine bead bracelet

Quartz (SiO₂), likely fuchsite-bearing aventurine

Tumbled yellow jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Tumbled pale chalcedony (likely quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartz

Copper Ore

Native Copper (Cu) often found with Chalcocite (Cu2S) or Bornite (Cu5FeS4)

Native Copper

Native Copper (Cu)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Unknown metallic sulfide-bearing rock, possibly chalcopyrite or bornite

Tentative: chalcopyrite (CuFeS₂) or bornite (Cu₅FeS₄)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Biotite Granite

Phaneritic Felsic Igneous Rock

Tumbled green-yellow chalcedony (likely prehnite or serpentine)

Cryptocrystalline quartz (chalcedony), SiO₂; identification is uncertain from the photograph

Pallasite Meteorite

Pallasite (ST-class)

Transit Token (RTD Denver)

Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)

Vanadinite

Lead Chlorovanadate - Pb5(VO4)3Cl

Ironstone concretion

Siderite or Limonite-rich Concretion (FeO(OH)·nH2O)

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Copper Nugget

Native Copper (Cu)

Vanadinite

Pb5(VO4)3Cl

Malaysian 50 Sen Coin

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

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Orbicular jasper (likely ocean jasper)

Silica-rich jasper, predominantly microcrystalline quartz (SiO₂), with iron-oxide and volcanic/mineral inclusions

Obsidian (likely black volcanic glass)

Obsidian; primarily amorphous volcanic silica glass, approximately SiO₂-rich rhyolitic composition

Quartz Sand (Beach Sand)

Silicon Dioxide (SiO2)

Vanadinite on Barite

Pb5(VO4)3Cl (Vanadinite) with BaSO4 (Barite)

Tumbled or broken translucent quartz-like fragment

Quartz (silicon dioxide, SiO₂), possibly chalcedony or calcite