Not A Natural Rock (Man Made Composite)

Green Quartz / Chrysoprase / Sea Glass

Silicon Dioxide (SiO2)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Turquoise cabochon (likely stabilized or imitation)

Turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Polished agate or chalcedony cabochon

Microcrystalline quartz (SiO₂), likely pale chalcedony/agate

Carved Gemstone Mushroom

Quartz / Feldspar composite (Carved lapidary art)

Diamond (in a cluster setting)

Crystallized Carbon (C)

Colorless faceted quartz-like gemstone

Likely quartz (SiO₂), though the appearance may also indicate man-made glass or cubic zirconia

Polished, carved gemstone (possibly dyed agate or glass-like material)

Unconfirmed from the image; no specific mineral can be identified reliably

Polished blue copper mineral, likely chrysocolla or dyed howlite

Chrysocolla: hydrated copper phyllosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; visual identification is uncertain from the image

Small tumbled blue-green stone, possibly chrysocolla or turquoise

Indeterminate copper-bearing mineral; possible chrysocolla (Cu₂H₂Si₂O₅(OH)₄·nH₂O) or turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O)

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Diamond in Kimberlite

Diamond (C in Kimberlite)

Sandstone Concretion

Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Porous iron-rich rock or slag-like material

Unidentified; possibly limonite/goethite-rich ironstone

Colorless faceted gemstone, likely glass or cubic zirconia

Uncertain; possible cubic zirconia (ZrO₂) or quartz (SiO₂), but the image may show a man-made simulant

Man-made Synthetic Material (Not a rock or mineral)

Polyester (Polyethylene terephthalate) / Faux Fur

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sandstone (likely Quartzose Sandstone)

Arenite

Sandstone

Arenite (SiO2 primarily)

Swirled Agate Bead

Silicon Dioxide (SiO2)

Mixed polished gemstone and mineral collection

Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces

Goldstone (Brown)

Aventurine glass

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Tektite

Impactite (Natural Silicate Glass)

Granite

Intrusive Felsic Igneous Rock (primarily Quartz and Feldspar)

Blue-green quartz-rich stone, possibly chrysoprase or aventurine

Uncertain; likely quartz (SiO₂) with green coloration from nickel-bearing minerals or inclusions

Granite

Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Red coral chip bracelet

Corallium spp.; skeleton composed primarily of calcium carbonate (aragonite)

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment

Sandstone

Arenite (variable SiO2 composition)

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Goldstone (Red)

Aventurine Glass

Diamond (in Jewelry Setting)

Carbon (C)

Ferrous Slag

Iron/Steel Slag (Complex Calcium-Alumino-Silicates)

Man-made Ceramic / Clay Figurine

Aluminosilicate Ceramic (Processed Clay)

Glass

Amorphous Silicon Dioxide (SiO2)