Synthetic (Not A Rock Or Mineral)

Small dark stone (unidentified)

Undetermined; image lacks enough detail for reliable identification

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

Polyester (Polyethylene terephthalate) / Faux Fur

Likely iron-rich slag or dark ironstone

Indeterminate from photograph; possibly iron-rich industrial slag (Fe–Si–O glass/oxides) or ironstone

Small tan stone (undetermined)

Unidentified fine-grained geological material; species cannot be determined from the image

Blue-gray stone pebble (possibly slag or a weathered rock)

Unidentified fine-grained rock; composition cannot be determined from the image

Small pale stone (unidentified)

Undetermined; image detail is insufficient for reliable identification

Cubic Zirconia (as used in jewelry setting)

Zirconium dioxide (ZrO2)

Small tan rock fragment

Unidentifiable lithic fragment; mineral composition undetermined

Unidentified rough mineral fragments

Likely quartz- or feldspar-bearing rock; exact identification requires testing

Unidentifiable Specimen

Undetermined

Small rough mineral/rock fragment

Unidentified; image detail is insufficient for a reliable species identification

Opalite

Synthetic glass (Opalite simulant)

Small rough mineral/rock specimen (not confidently identifiable)

Undetermined; image detail is insufficient for a reliable identification

Unidentified gray rock/mineral specimen

Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen

Rock Crystal (Clear Quartz)

Silicon dioxide (SiO2)

Small red-brown mineral or rock fragment

Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide

Weathered iron-rich rock, possibly laterite or ironstone

Indeterminate ferruginous rock; likely iron-oxide-cemented material (goethite/limonite ± hematite)

Green stone fragment (unidentified)

Undetermined; possibly serpentine or greenstone, but the image is insufficient for identification

Opalite

Synthetic Opalite Glass

Gemstone ring (stone not identifiable)

Unknown; the small central stone may be a colorless gemstone or glass, and the surrounding metal is gold-colored alloy

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

The user-provided image does not contain a rock or mineral specimen

Lava Stone and Chakra Beads

Basalt (with various mineral/synthetic beads)

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Greenstone pebble (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals

Limonite (Iron Ore)

Limonite; FeO(OH)·nH2O

Small pale stone fragment (undetermined)

Unidentified; the image lacks diagnostic detail for a reliable identification

Unidentified gray rock fragment

Indeterminate from image; possibly quartz- or feldspar-rich silicate material

Note on Image Identification: Textile

N/A (Anthropogenic material)

Small rock fragment (unidentified)

Undetermined; the image does not show enough detail for reliable identification

Painted Rock

Weathered Sedimentary Rock (Painted)

Opalite

Synthesized glass / Silicon dioxide glass

Small pink mineral fragment

Indeterminate; possibly rose quartz or feldspar

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Faceted Gemstone

Unknown transparent mineral, possibly Diamond (C), Cubic Zirconia (ZrO2), Quartz (SiO2), or Glass

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Pink granite

Granite, chiefly quartz, potassium feldspar, and plagioclase with minor mica

Granite

Granite, a coarse-grained intrusive felsic igneous rock composed chiefly of quartz, feldspar, and mica

Portable Ceramic Space Heater

Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Ruby-set gold ring

Ruby (corundum), Al₂O₃ colored red by chromium; mounted in a gold alloy

Blue Goldstone

Man-made glass with cobalt and metal flecks