Mineral (Man Made Glass)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Diamond (or Diamond Simulant)

Carbon (C)

Goldstone

Aventurine Glass (SiO2 + Cu small inclusions)

Asphalt Pavement (with aggregate)

Asphalt concrete

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Aragonite

Aragonite (Calcium Carbonate - CaCO3)

Amethyst crystal fragment

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron and irradiation

Diamond (in jewelry setting)

Diamond (C - Carbon)

Blue glassy mineral fragment, possibly sodalite or dyed/cobalt glass

Uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) if natural, but vivid blue color may indicate cobalt-colored glass

Precious Coral (Red Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Green aventurine (likely), shaped star

Quartz, SiO₂, with green fuchsite inclusions

Small water-worn pebble, likely granite or granitic rock

Granite (tentative; exact identification is uncertain from the photo)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Pyrite

Iron Sulfide (FeS2)

Chalcedony (Agate / Jasper Specimen)

Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Smoky Quartz

Smoky Quartz (SiO2)

Sea glass (likely green bottle glass)

Human-made soda-lime silicate glass; not a natural mineral or geological rock

Tektite

Natural impact glass

Blue Slag Glass

Ferro-silicate glass (Slag)

Blue Goldstone

Aventurine Glass (Silicon Dioxide with metal inclusions)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Water-worn Cobble)

Arenite (SiO2 with CaCO3 or Fe2O3 cement)

Sandstone

Arenite (primarily SiO2)

Chert (flint), likely a weathered nodule fragment

Microcrystalline quartz (SiO₂), commonly termed chert or flint

Diamond

Carbon (C)

Rounded quartz pebble

Quartz (silicon dioxide, SiO₂)

Yellow Sapphire (Raw)

Corundum (Al2O3)

Polished/tumbled brown-and-white mineral fragment

Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral

Sandstone (Pebble)

Sandstone (SiO2 with matrix/cement)

Polished smoky quartz crystal point

Quartz (SiO₂), likely iron-colored or smoky quartz with milky inclusions

Larimar

Pectolite

Engraved purple stone cabochon, possibly amethyst

Unconfirmed; if amethyst, quartz (SiO₂)

Sandstone

Arenite (SiO2 based clastic rock)

Yellow faceted gemstone, likely citrine or synthetic glass

Citrine (quartz, SiO₂) is the leading natural possibility; visual identification is uncertain from the photograph

Blue opalite (often sold as synthetic opal)

Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)

Dark quartz point (possibly smoky quartz)

Quartz, SiO₂; the dark color may indicate smoky quartz, but the image is insufficient to confirm

Tourmalinated quartz point

Quartz (SiO₂) containing black tourmaline, usually schorl (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Sandstone (Quartz Arenite)

Sandstone (dominated by SiO2 quartz grains)

Goldstone (Red)

Aventurine Glass

Diamond (in a jewelry setting)

Carbon (C)