Man Made Object (Metalwork)

White pebble, likely quartz or calcite

Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Polished blue glassy mineral specimen, likely sodalite or blue aventurine

Most consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), though dyed quartzite or blue glass cannot be excluded from the photograph

Cubic Zirconia (Jewelry Setting)

Zirconium Dioxide (ZrO2)

Diamond

Native Carbon (C)

Conglomerate

Conglomerate (clastic sedimentary rock)

Blue Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Sea Glass

Amorphous silicon dioxide (man-made glass weathered by nature)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Blue Goldstone

Synthetic glass with cobalt and copper inclusions

Cubic Zirconia (Jewelry Setting)

Cubic Zirconia (ZrO2)

Aluminum Slag

Anthropogenic Aluminum (Al)

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Dragon's Breath (Mexican Opal Glass)

Artisan Foil Glass (SiO2 based)

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Concrete rubble

Anthropogenic conglomerate

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

Black onyx or black agate cabochon

Cryptocrystalline chalcedony, SiO₂; likely black chalcedony/onyx, though dyed material is possible

Cassiterite (Tin Ore)

Cassiterite (Tin(IV) Oxide, SnO2)

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety

Tumbled milky quartz pebble

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

Slag

Anthropogenic Vitreous Silica/Iron oxides

Likely tumbled red mineral or glass imitation

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

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Dalmatian Stone

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

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Tourmalinated quartz point

Quartz (SiO₂) with black tourmaline (schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) inclusions

Pearl-and-gemstone insect brooch

Pearl: nacre (aragonite, CaCO₃); colored stones are likely synthetic or natural corundum/spinel/glass, not determinable from the image

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Agate

Banded Chalcedony (SiO2)

Asphalt Chunk (Bituminous Concrete)

Aggregated Bitumen / Artificial Breccia

Felsic Drill Core (likely Gneiss or Granite)

Felsic Metamorphic Rock (Gneissic profile)

Concrete with Exposed Aggregate

Anthropogenic conglomerate (Concrete)

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)

Beaded gemstone jewelry (likely amethyst, lapis lazuli, and pearl or glass imitation)

Mixed mineral beads; possible quartz (SiO₂) and lazurite-bearing lapis lazuli