Manufactured Glass

Oak-grain Laminate (Industrial/Decorative Furniture Finish)

Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)

Likely polished dark gemstone cabochon

Indeterminate; possibly black chalcedony/agate, obsidian, or glass imitation

Green aventurine pendant

Quartz variety, SiO₂, colored mainly by fuchsite or other chromium-bearing mica inclusions

Green sea glass (likely bottle glass)

Man-made soda–lime silicate glass; not a natural mineral

Cullet (Slag Glass)

Amorphous Silica (Industrial byproduct)

Colorless faceted gemstone (likely cubic zirconia)

Cubic zirconia, ZrO₂ (synthetic zirconium dioxide); possibly synthetic glass or lab-grown diamond

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

Polyester (Polyethylene terephthalate) / Faux Fur

Weathered concrete or cementitious slab (not natural rock)

Artificial calcium-silicate cement composite; likely Portland cement concrete

Iridescent polished gemstone, likely opal

Common or precious opal (hydrated amorphous silica, SiO₂·nH₂O), possibly synthetic or glass imitation

Road-surface aggregate (crushed stone)

Unidentifiable mixed lithic aggregate; likely basaltic/andesitic fragments with feldspar, quartz, and weathered rock

Pearl necklace

Pearl—biogenic calcium carbonate, primarily aragonite (CaCO₃)

Small rounded stone, likely quartz-rich granite or granitic rock

Probable granitoid fragment; mainly quartz (SiO₂) and feldspar, with minor dark mica/amphibole

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

White tumbled stone (possibly milky quartz)

Likely quartz, SiO₂; exact identification is uncertain from the image

Rounded light-colored stone, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂)

Small quartz-rich stone, possibly granite fragment

Indeterminate; likely quartz (SiO₂) with feldspar and/or mica

Cubic Zirconia

Zirconium Dioxide (ZrO2)

Painted pebble, likely a smooth river stone

Unidentified fine-grained natural rock; exact lithology cannot be determined from the image

Small brown rock fragment; exact identification uncertain

Unidentified fine-grained lithic fragment

Clear faceted gemstone, likely synthetic cubic zirconia

Cubic zirconia (zirconium dioxide, ZrO₂); visual identification is not definitive and diamond or synthetic moissanite are alternatives

Likely ironstone concretion or weathered iron-rich rock

Goethite/hematite-bearing limonite (FeO(OH)·nH₂O / Fe₂O₃)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Quartz (Gray or Smoky variety)

Silicon Dioxide (SiO2)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial byproduct)

Build-A-Bear Plush (Non-Geological)

Polyester fibers (C10H8O4)n and Synthetic Polymers

Wood Paneling

Engineered Wood / Plywood Paneling

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Quartz Vein Specimen

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Boulder

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz in Host Rock

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Milky Quartz

SiO2 (Silicon Dioxide)

Quartz pebble

Silicon dioxide (SiO2)

Sandstone

Sedimentary Rock (Quartz arenite/Arkose)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2)