Antropogenic (Man Made)

Blue Goldstone

Aventurine Glass

Terrazzo (Synthetic Composite Rock)

Cementitious or Epoxy Resin-bound Aggregates

Synthetic Costume Glove (Paws)

Polyethylene terephthalate (Polyester) & Polyurethane blend

Sea Glass (Teal/Turquoise)

Amorphous Silica (SiO2) with trace metal oxides

Sea Glass (Turquoise/Aqua)

Amorphous Silica (SiO2) with transition metal dopants

Quartz

Silicon dioxide (SiO₂)

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various metal oxide impurities

Asphalt (Bituminous Concrete)

Bituminous mix / Anthropogenic conglomerate

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

United States Quarter Dollar

Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)

Green Glass Cullet / Recycled Glass

Amorphous Silicon Dioxide (SiO2) with various metal oxides

Cullet Glass (Industrial Slag Glass)

Amorphous Silica (SiO2) with metallic oxide impurities

Glazed Ceramic Tile

Fused Silicate-Clay composite

Metallic Ornament / Jewelry

N/A - This is an artificial object, not a geological specimen.

Polished stone sphere, possibly agate or jasper

Likely microcrystalline quartz (SiO₂); exact variety cannot be confirmed from the image

White drusy quartz

Quartz, silicon dioxide (SiO₂), with a drusy coating of tiny crystals

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), tentative identification; the photo is insufficient to confirm the material

Goldstone (likely blue-free synthetic goldstone pendant)

Synthetic aventurine glass; silica glass with dispersed metallic copper crystals

Brown chert (flint)

Microcrystalline quartz (SiO₂), varieties called chert or flint

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Polished greenstone/serpentine pebble (probable)

Serpentinite, dominated by serpentine-group minerals (lizardite/chrysotile); possible accessory olivine or chlorite

Chert (possibly a worked stone flake)

Microcrystalline quartz, SiO₂

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

Beaded mineral/crystal jewelry (likely turquoise and coral accents)

Variable; blue beads may be turquoise (CuAl6(PO4)4(OH)8·4H2O), with possible dyed howlite, glass, or composite materials

Paving-concrete aggregate with a rounded stone

Polymictic gravel aggregate; the central clast appears to be weathered sandstone or volcanic rock

Basalt

Basalt

Yellow chalcedony (likely agate) cabochons

Microcrystalline quartz, SiO₂; chalcedony variety, possibly naturally colored or dyed

Granite

Granite (plutonic igneous rock)

Iron-stained quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Flint or chert, possibly a knapped stone tool

Microcrystalline quartz (SiO₂), commonly chalcedony with possible carbonaceous impurities

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Carved yellow stone butterfly

Undetermined; possibly carved soapstone (talc-rich rock) or another soft ornamental stone

Fossilized echinoid (sea urchin), likely a flint/chalk-associated test

Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)

Diabase (Dolerite)

Diabase / Dolerite

Land Snail Shell

Gastropoda (Calcium Carbonate, CaCO3)

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Sandstone

Arenite

Pale green aventurine (likely quartz) sphere

Quartz, SiO₂; possibly pale green aventurine, with color from inclusions or treatment

Dark quartz point (possibly smoky quartz)

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

Quartzite

Metamorphic Quartz Sandstone

Quartzite

Metamorphic Quartzite (SiO2)