Mineral (Processed Metal)

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Blue Goldstone

Man-made glass with suspended copper, cobalt, or manganese particles

Galena in Quartz Matrix

Lead Sulfide (PbS) in Silicon Dioxide (SiO2)

Bismuth

Native Bismuth (Bi)

Satin Spar (Satin Spar Gypsum)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Quartzite

Quartzite (SiO2)

Green gemstone in a jewelry setting (possibly emerald or green glass)

Not identifiable from the image; if natural emerald, beryl (Be₃Al₂Si₆O₁₈)

Petrified Coral (Agatized Coral)

Fossilized Anthozoa (Silicon Dioxide replacement - SiO2)

Heat-Treated Amethyst (Commercial Citrine)

Silicon Dioxide (SiO2) - Macro-crystalline Quartz

Blue Onyx (Dyed Agate/Chalky Chalcedony)

Silicon Dioxide (SiO2) with artificial pigment

Tiny metallic mineral grain (possibly native silver or a metallic sulfide)

Undetermined from the photograph; native silver (Ag) is one possibility, but identification requires examination or testing

Quartz-Veined Porphyritic Basalt

Igneous rock with quartz vein (SiO2)

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Unidentified gray metallic object

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

Pink-red faceted gemstone ring (likely garnet)

Possibly pyrope–almandine garnet, (Mg,Fe)₃Al₂(SiO₄)₃; identification from the image is uncertain

Red coral beads (likely dyed or treated coral)

Corallium spp. (precious coral; calcium-carbonate skeleton, chiefly calcite)

Bismuth Crystal

Bismuth (Bi)

Likely scoria (vesicular basalt)

Scoria, typically basaltic; composed mainly of plagioclase, pyroxene, and sometimes olivine

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Yellow Beryl

Beryl (Be3Al2(SiO3)6)

Gold-bearing quartz in a dark host rock (possible gold-in-quartz specimen)

Quartz (SiO₂) with possible native gold (Au) in a fine-grained host; exact identification is uncertain from the photo

Selenite (satin-spar gypsum)

Gypsum, CaSO₄·2H₂O; fibrous variety commonly called satin spar

Slag (Industrial By-product)

Glassy silicate or metallic smelting residue

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Heat-Treated Citrine (Amethyst-based)

Quartz (Silicon Dioxide) - SiO2

Quartz Vein in Granite

Crystalline Silicon Dioxide (SiO2) in Granitic Matrix

Milky quartz with iron staining

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

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

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

Rainbow Hematite (Titanium Coated)

Iron(III) oxide (Fe2O3) with Titanium/Metal Oxide coating

Vein Quartz in Host Rock

Silicon Dioxide (SiO2) vein in sedimentary/metamorphic matrix

Cubic Zirconia (Simulated Diamond)

Cubic Zirconia (ZrO2)

Clear quartz (rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Lepidolite

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

Chrysocolla-rich copper ore

Chrysocolla, a hydrated copper silicate; composition is variable and commonly mixed with quartz or copper oxides

Native Silver

Silver (Ag)

Pink faceted gemstone, possibly pink sapphire

Uncertain from the image; possibly corundum (Al₂O₃)

Native Silver

Silver (Ag)

Lepidolite Granite

Granite with lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2)

Chalcedony (Yellow Agate)

Cryptocrystalline Quartz (SiO2)

Bornite (Peacock Ore) / Acid-treated Chalcopyrite

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2)

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

Tumbled yellow jasper

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