Man Made Glass

Lapis lazuli and green-blue chalcedony jewelry

Lapis lazuli: lazurite-bearing metamorphic rock, chiefly lazurite (Na₃Ca(Al₃Si₃O₁₂)S) with calcite and pyrite; second stone: likely chrysoprase or green-blue chalcedony (microcrystalline quartz, SiO₂)

Black tourmaline bead bracelet (likely schorl)

Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Goldstone

Avventurina (Cu + SiO2 glass)

Chert (Iron-stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Clay Brick

Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)

Synthetic Costume Accessory (Non-Geological)

Polyester and Acrylic Fiber (Anthropogenic polymer)

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Porcelain (Kaolin-based)

Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)

Asphalt (Bituminous Concrete)

Composite material (bitumen binder with mineral aggregate)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Clear quartz crystal pendant

Quartz (silicon dioxide, SiO₂)

Obsidian (likely snowflake or banded variety)

Volcanic glass, primarily SiO₂

Polished black stone egg, probably black obsidian

Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements

Chert (Jasper/Flint variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Amber cabochon pendant

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Chert (specifically Yellow/Brown Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)

N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)

Black tourmaline bead bracelet, possibly mixed with smoky quartz or brown tourmaline

Schorl tourmaline, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄; exact beads cannot be confirmed visually

Polished amethyst bead fragments

Amethyst, purple quartz (SiO₂)

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

Flint / Chert

Microcrystalline Quartz (SiO2)

Chert (specifically White Chert or Novaculite)

Silicon Dioxide (SiO₂)

Blue-dyed Quartz Druzy

Silicon Dioxide (SiO2) with artificial pigment

Carved quartz (likely rose quartz and green aventurine/quartz)

Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine

Titanium Coated Aura Quartz (Apple Aura Quartz)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating

Banded agate pendant (likely carnelian or brown-and-white chalcedony agate)

Agate, a banded variety of chalcedony; microcrystalline quartz, SiO₂, with iron-oxide coloration

Chert (and Flint)

Silicon Dioxide (SiO2)

Flint

Silicon Dioxide (SiO2) - Chert variety

Vesicular basalt (likely scoria)

Basaltic scoria; predominantly plagioclase, pyroxene, and olivine in a mafic volcanic glass/microcrystalline matrix

Polished white chalcedony or milky quartz pebble

Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion

Red-and-brown agate bead bracelet

Agate, a microcrystalline variety of quartz (SiO₂), likely colored chalcedony/carnelian

Green Banded Chert (Agate/Jasper)

Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)

Black onyx or black agate bead bracelet

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

Amethyst bead bracelet

Amethyst, purple quartz (SiO₂), with likely dyed or heat-treated agate/carnelian beads

Amethyst

SiO2 (Silicon Dioxide)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Pearl-embellished decorative cross

Pearl (biogenic calcium carbonate, predominantly aragonite) with rhinestone-mounted glass or synthetic gemstones

Diamond Plate (Steel)

Alloyed Carbon Steel or Aluminum with 'Durbar' pattern

Asphalt Chunk (with aggregate)

Bituminous concrete / Anthropogenic conglomerate

Green Aura Quartz (Titanium treated Kyanite or Quartz)

Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating

Granite (weathered pebble)

Granite (plutonic igneous rock)