Sedimentary (Artificial)

Polished granite pebble

Granite; chiefly quartz, feldspar, and mica/amphibole

Dyed Howlite

Borosilicate hydroxide (Ca2B5SiO9(OH)5)

Dragon Vein Agate (Dyed)

SiO2

Dzi Bead (Agate Bead)

Cryptocrystalline Quartz (SiO2) - Chalcedony/Agate

Concrete-embedded rock fragment, likely weathered granite or gneiss

Probable granitic silicate assemblage: quartz, feldspar, and dark mica/amphibole

Tumbled blue-dyed stone, likely basalt or blue aventurine

Likely fine-grained basalt (plagioclase and pyroxene), possibly coated or dyed; exact identification requires testing

Pink Dyed Agate Geode Slice

Cryptocrystalline Quartz (SiO2)

Peacock Ore

Bornite (Cu5FeS4) with artificially induced tarnish

Blue metallic mineral specimen, possibly bornite or chalcopyrite

Bornite (Cu₅FeS₄) or chalcopyrite (CuFeS₂); exact identification requires testing

Uncertain dark metallic mineral specimen

Possibly galena (lead sulfide, PbS), though the image is too blurred for reliable identification

Smoky Quartz

SiO2 (Silicon Dioxide)

Peridot

Olivine ((Mg, Fe)2SiO4)

Lemon Quartz

Silicon Dioxide (SiO2)

Dyed or coated quartz/amethyst specimen (likely)

Quartz, SiO₂; purple portion may be amethyst, iron-bearing quartz

Copper-bearing quartz/rock fragment with attached mica

Chalcopyrite-bearing quartz or altered igneous rock; attached flake likely muscovite or biotite mica

Tumbled polymetallic mineral specimen, likely chalcopyrite-bearing ore

Probable chalcopyrite (CuFeS₂) with quartz and iron-oxide minerals; exact identification is uncertain from the photograph

Dyed Agate Geode

Silicon Dioxide (SiO2) - Banded Chalcedony

Dyed blue chalcedony (likely dyed agate or quartzite)

Chalcedony, microcrystalline SiO₂; blue color likely artificial dye

Dyed pink agate slice

Agate (microcrystalline quartz, SiO₂), commonly chalcedony with artificial dye

Granite-like rock fragment

Likely leucocratic granite or granitic pegmatite; exact identification requires a fresh surface and mineral testing.

Aura Quartz (Pink/Magenta Aura Quartz)

Silicon Dioxide (SiO2) treated with vapor-deposited precious metals

Polished vesicular basalt (likely iron-rich volcanic rock)

Basalt, predominantly plagioclase–pyroxene–olivine; surface may include iron-oxide minerals or metallic-looking infill

Olivine (Peridot)

Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Polished porphyritic volcanic pebble

Likely porphyritic basalt or andesite; exact identification requires a fresh surface and mineral tests

Citrine (Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Quartz (likely milky quartz or quartz glass-like fragment)

Quartz, silicon dioxide (SiO₂)

Tumbled quartz pebble, likely iron-stained quartz

Quartz (silicon dioxide, SiO₂), possibly milky quartz with limonite/goethite staining

Smelter Slag

Anthropogenic Silicate Slag

Tumbled smoky quartz

Quartz (SiO₂), brown smoky variety

Aura Quartz (Coated Quartz)

Silicon Dioxide (SiO2) coated with vaporized metals

Red Tiger's Eye

Silicon dioxide with crocidolite inclusions, SiO2

Red Tiger's Eye

Silicon dioxide with iron oxides, SiO2

Likely smoky quartz pendant

Smoky quartz, silicon dioxide (SiO₂), quartz variety colored by irradiation-related defects

Smoky quartz-bearing rock

Smoky quartz (SiO₂), possibly in a pegmatitic or quartz-rich matrix

Citrine Quartz / Yellow Quartz Pebbles

Silicon Dioxide (SiO2)

Green Banded Agate

Agate (Variety of Chalcedony/Quartz), SiO2

Yellow Quartz (possibly dyed)

Silicon Dioxide (SiO2)

Slag (Industrial Byproduct)

Anthropogenic Vitreous Silicate material

Banded Agate (Dyed)

Silicon Dioxide (SiO2) with impurities

Industrial slag (iron/copper smelting slag)

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