Man Made Material (Metal)

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Polished yellow-green serpentine pendant

Serpentine-group minerals, chiefly antigorite and/or lizardite; approximate formula Mg3Si2O5(OH)4

Polished black stone, likely black obsidian

Obsidian (volcanic glass), chiefly silica-rich rhyolitic composition

Heart-shaped faceted gemstone pendant

Likely yellow quartz (citrine) or synthetic yellow stone, set in metal with small clear accent stones

Tumbled milky chalcedony (likely common opalite-like quartz)

Chalcedony, microcrystalline SiO₂; possibly pale common opal, hydrated SiO₂·nH₂O

Polished white chalcedony or quartz pendant

Microcrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Titanium Aura Quartz

Titanium bonded Silicon Dioxide (SiO2 + Ti)

Goldstone (Red)

Aventurine Glass (SiO2 + Cu)

Blue opal heart cabochon

Common opal, hydrated amorphous silica (SiO₂·nH₂O), likely blue-dyed or synthetic opalite

Aura Quartz (Titanium Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti)

Concretion (Sandstone)

Carbonate-cemented Sandstone Concretion

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Blue Crackle Quartz (Dyed Quarzite)

Silicon Dioxide (SiO2) with artificial dye

Slag (Industrial Glass/Metal)

Ferrous slag or Glassy silicate byproduct

Botryoidal chalcedony (likely agate/jasper variety)

Microcrystalline quartz, SiO₂

Clear Quartz Sphere (Rock Crystal)

Silicon Dioxide (SiO2)

Red-orange jasper pebble (tentative)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides

White cabochon gemstone, likely milky chalcedony or opalite

Chalcedony: microcrystalline quartz, SiO₂; appearance may also indicate synthetic opalite glass

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Goldstone (Red)

Aventurine Glass (Cupriferous glass)

Black onyx or black agate bead bracelet

Microcrystalline quartz, chiefly chalcedony (SiO₂); commonly sold as black onyx, sometimes dyed black agate

Amber cabochon pendant

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Opalite

Synthetic Glass (Simulated Opal)

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Polished obsidian

Volcanic glass; predominantly rhyolitic SiO₂

Ferro-slag (Leland Blue/Slag Glass)

Anthropogenic Vitreous Silica (Industrial Slag)

Carborundum

Silicon Carbide (SiC)

Likely smoky quartz pendant

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

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

Red cabochon gemstone ring (likely ruby or red spinel; identity unconfirmed)

Possibly corundum (ruby, Al₂O₃) or spinel (MgAl₂O₄); visual identification alone cannot distinguish these from glass or synthetic stones.

Opalite

Synthetic Glass (Amorphized Silicon Dioxide)

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

Red-orange cabochon, likely carnelian or glass imitation

Carnelian: chalcedony (microcrystalline SiO₂), commonly iron-colored

Vesicular basalt (weathered scoria)

Scoriaceous basalt; chiefly plagioclase, clinopyroxene, olivine, and iron-titanium oxides

Opalite

Man-made Glass (Synthetic Opalized Glass)

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Green cabochon gemstone, likely nephrite jade

Nephrite jade—interlocking amphibole fibers, chiefly tremolite-actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂

Orgonite Pyramid (containing Amethyst and mixed minerals)

Silicon Dioxide (SiO2) in synthetic resin

Cullet (Slag Glass)

Amorphous Silica (Industrial byproduct)

Diamond

Carbon (C)