Sedimentary (Artificial)

Banded Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Vesicular basalt (likely iron-rich scoria)

Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, olivine, and Fe-Ti oxides

Blue Tiger's Eye (Hawk's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2)

Chalcopyrite (Peacock Ore)

Copper Iron Sulfide (CuFeS2)

Citrine (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

Tourmalinated quartz crystal point

Quartz (SiO₂) with black tourmaline (schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) inclusions

Likely yellow quartz gemstone ring

Quartz (SiO₂), possibly heat-treated citrine or lemon quartz; metal setting appears to be brass/gold-colored alloy

Tumbled green aventurine (probable)

Quartz (SiO₂) with fuchsite or other green mica inclusions

Tumbled pink granite

Granite, chiefly quartz, alkali feldspar, and plagioclase with minor mica/amphibole

Tumbled milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Blue Dyed Agate

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Dyed Blue Agate (Slab)

Agate (Variety of Chalcedony/Microcrystalline Quartz), SiO2

Tumbled smoky quartz

Quartz, silicon dioxide (SiO₂), brown variety colored by irradiation and trace aluminum

Smoky quartz crystal

Quartz, silicon dioxide (SiO₂), likely smoky variety

Possible chalcopyrite-bearing sulfide fragment

Likely chalcopyrite (CuFeS₂), possibly with pyrite or bornite

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Blue Dyed Agate Geode Slice

Chalcedony (Silicon Dioxide, SiO2) with artificial cobalt/iron-based dye

Mystic Topaz

Al2SiO4(F,OH)2 (Coated)

Likely raw chalcopyrite or bornite specimen

Chalcopyrite (CuFeS₂), possibly bornite (Cu₅FeS₄)

Tumbled smoky quartz (probable)

Quartz, silicon dioxide (SiO₂), smoky variety

Amethyst geode

Quartz, SiO₂; purple variety: amethyst

Black onyx or black agate bead necklace

Microcrystalline quartz, SiO₂ (likely chalcedony/black agate; possibly dyed)

Heat-Treated Citrine

Silicon Dioxide (SiO2) with iron impurities

Heat-Treated Citrine (Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Green fluorite tower

Fluorite (calcium fluoride, CaF₂)

Polished dark stone, likely basalt

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, with possible olivine and magnetite

Dyed agate (likely dyed chalcedony)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

Tumbled blue-green stone, likely chrysocolla or dyed chalcedony

Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony

Heat-Treated Citrine (Amethyst Cathedral with Agate inclusions)

Silicon Dioxide (SiO2) with iron impurities

Black Agate

Chalcedony (SiO2)

Agate (Polished Slice)

Banded Chalcedony (SiO2)

Basalt cobble

Fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene, commonly with olivine

Likely iron meteorite

Iron–nickel meteorite, commonly octahedrite (kamacite–taenite)

Dyed druzy quartz geode

Quartz, silicon dioxide (SiO₂), likely artificially dyed

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)

Tumbled blue stone, likely blue aventurine or dyed quartzite

Quartz (SiO₂), likely with inclusions or artificial dye; exact identification requires testing

Heat-Treated Citrine

Quartz (Silicon Dioxide, SiO2)

Blue Agate (likely dyed)

Silicon Dioxide (SiO2)

Smoky Quartz

SiO2 (Silicon Dioxide)