Sedimentary (Artificial)

Dyed blue quartz or druzy geode (likely)

Quartz, silicon dioxide (SiO₂), probably artificially colored

Black Agate

Chalcedony (SiO2)

Agate (Polished Slice)

Banded Chalcedony (SiO2)

Goldstone

Not a natural mineral or rock. It is an ornamental glass.

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Peacock ore (bornite/chalcopyrite), likely treated

Bornite, Cu₅FeS₄, and/or chalcopyrite, CuFeS₂

Smoky quartz

Quartz (SiO₂), brown-to-gray smoky variety

Peacock Ore (Bornite or Chalcopyrite)

Bornite (Cu₅FeS₄) or iridescent Chalcopyrite (CuFeS₂)

Heat-Treated Citrine

Quartz (Silicon Dioxide, SiO2)

Blue Agate (likely dyed)

Silicon Dioxide (SiO2)

Green chalcedony (likely dyed or treated)

Chalcedony, microcrystalline quartz (SiO₂)

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂), likely pale amethyst or iron-stained quartz

Smoky Quartz

SiO2 (Silicon Dioxide)

Agate (Dyed Blue)

SiO2 (Silicon Dioxide)

Dyed Agate

Agate (Cryptocrystalline Quartz), SiO2

Iridescent chalcopyrite (“peacock ore”)

Chalcopyrite, CuFeS₂, commonly surface-oxidized to covellite and related copper sulfides

Obsidian

Volcanic glass, primarily SiO₂ (noncrystalline)

Peacock ore (iridescent chalcopyrite)

Chalcopyrite, CuFeS₂, commonly surface-treated to enhance iridescence

Tumbled metallic sulfide specimen, likely chalcopyrite

Chalcopyrite (CuFeS₂), possibly polished or coated

Smoky quartz

Quartz, silicon dioxide (SiO₂), smoky variety

Smoky Quartz

SiO2 (Silicon Dioxide with aluminum impurities)

Blue aventurine (likely dyed quartzite)

Quartz-rich quartzite, primarily silicon dioxide (SiO₂); identification is uncertain from the image

Heat-Treated Citrine (Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Likely chalcopyrite-bearing sulfide ore

Chalcopyrite (CuFeS₂), possibly with pyrite and secondary copper minerals

Dyed blue howlite (turquoise imitation), possibly dyed magnesite

Howlite: Ca₂B₅SiO₉(OH)₅; the vivid blue color is artificial dye. Exact identification is uncertain from the photograph alone.

Aura Quartz (Pink/Rose Aura Quartz)

Silicon Dioxide (SiO2) bonded with Platinum and/or Silver

Bismuth crystal

Bismuth (Bi), synthetic laboratory-grown crystal

Crackle Quartz (Dyed)

SiO2 (Silicon Dioxide) - Treated

Tumbled brown agate or jasper pebble

Microcrystalline quartz, chiefly chalcedony (SiO₂), possibly iron-stained jasper

Blue chalcedony (likely dyed or coated)

Microcrystalline quartz, SiO₂ (chalcedony)

Bismuth

Bismuth (Bi)

Agate

Agate (Silicon Dioxide, SiO2)

Dyed green howlite beads (likely)

Howlite, Ca₂B₅SiO₉(OH)₅, artificially dyed green

Blue-dyed agate (likely a polished agate cabochon)

Microcrystalline quartz, SiO₂ (chalcedony); likely artificially dyed blue

Dyed and polished crackle agate bead

Agate, microcrystalline quartz (SiO₂), commonly artificially crackled and dyed

Weathered copper-bearing sulfide rock (likely bornite/chalcopyrite)

Bornite (Cu5FeS4) and/or chalcopyrite (CuFeS2), with oxidation tarnish

Red-and-white porphyritic granite fragment

Granite, likely alkali-feldspar granite; quartz + feldspar with minor mafic minerals

Smoky Quartz

Silicon Dioxide (SiO2)

Dyed and polished agate beads

Chalcedony (microcrystalline quartz), SiO₂; commonly agate

Blue Obsidian

Volcanic Glass (SiO2 with inclusions)

Blue slag glass / industrial glass fragment

Artificial silicate glass, composition variable; likely copper- or cobalt-colored furnace slag

Peacock ore (iridescent chalcopyrite), likely heat-treated

Chalcopyrite, CuFeS₂; commonly sold as artificially oxidized “peacock ore”