Not A Natural Rock (Man Made Composite)

Concretion

Sedimentary Concretion (Ironstone / Calcite Concretion)

Sandstone Concretion

Sedimentary Clastic Rock (Silicate-rich)

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial pigment

Tiger Iron

Mixed Quartz, Hematite, and Tiger's Eye

Opalite

Synthetic glass (SiO2 + metal additions)

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Dyed Agate / Painted Stone

Silicon Dioxide (SiO2) with artificial pigment

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Iridescent bismuth crystal

Bismuth (Bi), artificially crystallized and likely oxidized/coated

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Sea Glass

Silicon dioxide (mostly)

Unidentified gray stone/concrete-like fragment

Indeterminate; likely a fine-grained carbonate or cementitious geological fragment

Blue Sapphire (Synthetic or Man-made Glass Imitation)

Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Blue Goldstone

Man-made glass with suspended copper, cobalt, or manganese particles

Hematite

Iron(III) oxide (Fe2O3)

Opalite

Synthetic Opalised Glass

Green obsidian (likely molded or heat-treated glass-like specimen)

Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)

Cullet (Slag Glass)

Amorphous Silica (Industrial byproduct)

Likely clear quartz crystal or glass-like gemstone

Quartz, silicon dioxide (SiO₂); exact identification is uncertain from the strongly magenta-lit image

Chrysocolla in Jasper / Green Jasper

Cu2-xAlx(H2-x)Si2O5(OH)4·nH2O in SiO2 matrix

Blue Crackle Quartz (Dyed Quarzite)

Silicon Dioxide (SiO2) with artificial dye

Colorless faceted gemstone, likely cubic zirconia

Cubic zirconia (zirconium dioxide, ZrO₂); visual confirmation is unavailable

Small pebble, likely limestone

Unidentified carbonate pebble, possibly micritic limestone (calcite, CaCO₃)

Carborundum

Silicon Carbide (SiC)

Blue-green cabochon, likely chalcedony or treated glass imitation

Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image

Tumbled turquoise cabochon

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly stabilized or dyed material

Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating

Possible slag or basalt fragment

Indeterminate dark mafic material; likely basalt (plagioclase–pyroxene) or industrial iron-rich slag

Polished white chalcedony or quartz pendant

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

Polished silver sheen obsidian heart

Obsidian (volcanic glass), primarily rhyolitic silica-rich glass

Concrete Fragment

Artificial Conglomerate (Cement and Aggregate)

Iron-rich vesicular rock, possibly slag or basalt

Uncertain; likely basaltic rock (plagioclase–pyroxene–iron oxide) or industrial iron slag

Blue tumbled glass-like specimen; likely blue slag glass

Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image

Raw quartz crystal

Quartz (silicon dioxide, SiO₂), likely milky or included quartz

Pink Cubic Zirconia (CZ)

Zirconium Dioxide (ZrO2)

Polished multicolored stone bead bracelet

Likely dyed or treated agate/jasper, chiefly microcrystalline quartz (SiO₂)

Turquoise ring (likely stabilized or imitation turquoise)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact material is uncertain from the image

Man-made Jewelry Charm (Enameled Metal)

Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)

Bouncy Ball (Synthetic Rubber Polymer)

Polybutadiene / Ethylene Vinyl Acetate (EVA)