Anthropogenic (Man Made Industrial Byproduct)

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Milky quartz

Quartz (silicon dioxide, SiO₂)

N/A - Man-made object (Jewelry Chain)

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Small rounded mineral pebble, possibly quartz

Uncertain; likely microcrystalline or crystalline SiO₂ (quartz), potentially with iron-oxide staining

Titanium Aura Quartz

Silicon Dioxide (SiO2) coated with Titanium and Niobium

Concretion with Geode Cavity

Ferruginous Sandstone Concretion with Quartz Center

Concrete fragment or Conglomerate

Artificial Conglomerate (Concrete) or Natural Conglomerate

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Likely tumbled red mineral or glass imitation

Indeterminate; possibilities include red jasper (microcrystalline quartz, SiO₂) or dyed chalcedony

Blue Impression Jasper beads

Impression jasper (microcrystalline quartz/chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions

Cupronickel (on a 1981 Mexico 20 Pesos coin)

Copper-Nickel Alloy (Cu75Ni25)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety

Polished opalite (likely man-made opalescent glass)

Opalite is a commercial name, not a mineral; typically opalescent glass, often soda-lime silicate glass

Slag (Industrial By-product)

Anthropogenic Vitreous Silica/Iron Silicate

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Sea Glass

Man-made vitreous material (silica-based glass)

Porcelain (White Ceramic)

Mullite-bearing Vitrified Ceramic (Major phases: Mullite Al6Si2O13, Glassy Silica SiO2)

Chakra Stone Tower (Composite Multi-Mineral)

Crystalline Silicon Dioxide composite (SiO2) with various inclusions

Tumbled milky quartz

Quartz — silicon dioxide (SiO₂), cryptocrystalline or microcrystalline variety possible

Asphalt Chunk (Bituminous Concrete)

Aggregated Bitumen / Artificial Breccia

Felsic Drill Core (likely Gneiss or Granite)

Felsic Metamorphic Rock (Gneissic profile)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)

Ironstone Concretion (Pot Stone)

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Crackled Quartz (Dyed)

Silicon Dioxide (SiO2)

Blue Goldstone

Aventurine Glass

Opalite

Man-made Glass (Synthetic Opalized Glass)

Opalite

Synthetic Glass / Man-made Opal Simulant

Goldstone

Avventurina (Man-made Glass with Copper inclusions)

Blue opalite glass cabochon (likely imitation opal)

Man-made opalescent glass; not a natural mineral

Opalite glass sphere (likely synthetic imitation)

Man-made opalescent glass; not natural opal

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Iron Slag

Iron Slag (Industrial Vitreous Material)

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony

Ocean Jasper Mushroom

Orbicular Jasper (Silicon Dioxide, SiO2 mixed with various impurities)

Opalite

Synthetic Glass (SiO2 + impurities)

Titanium-Coated Hematite (Aura Hematite)

Titanium-bonded Hematite (Fe2O3 with a Ti coating)

Green Aventurine

SiO2 (Silicon Dioxide with Fuchsite inclusions)

Aura Quartz Geodes (Lab-Altered)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition