Not A Rock (Man Made Industrial Metal)

Iron meteorite fragment (likely meteorite slice)

Fe–Ni metallic meteorite, possibly an octahedrite; exact classification requires laboratory analysis

Iron-stained quartz vein in altered host rock

Quartz (SiO₂) with iron oxides/hydroxides, likely hematite and goethite; host rock uncertain from the image

Goldstone (with Tiger's Eye and Quartz)

Aventurine glass (Synthetic SiO2 with Cu inclusions)

Goldstone

Avventurina (Cu + SiO2 glass)

Blue glassy gemstone cabochon, likely dyed chalcedony or glass

Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)

Opalite (likely man-made glass)

Opalite; amorphous silica glass, not a natural mineral

Faceted transparent gemstone pendant

Uncertain from image; likely faceted quartz (SiO₂), cubic zirconia (ZrO₂), or glass imitation

Goldstone (Red)

Aventurine Glass

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Dark green cabochon gemstone ring

Unknown; possibly green onyx (cryptocrystalline quartz, SiO₂) or another green gem

Polished black stone, likely black obsidian

Volcanic glass; predominantly rhyolitic silica glass (SiO₂-rich)

Polished milky quartz (likely quartz worry stone or wand)

Quartz, silicon dioxide (SiO₂)

White quartz pebble

Quartz (SiO₂), likely milky quartz

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

Polyester (Polyethylene terephthalate) / Faux Fur

Bauxite

Bauxite (mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

Likely metallic meteorite fragment

Unclassified iron-rich meteorite; possible stony-iron or iron meteorite

Possible iron meteorite fragment

Iron meteorite, likely kamacite–taenite alloy

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Quartz Pebble

Silicon Dioxide (SiO2)

Gold-bearing Quartz Ore

Auriferous Quartz (SiO2 with Au)

Opalite

Synthetic Glass (Simulated Opal)

Tumbled quartz pebble

Quartz, silicon dioxide (SiO₂), likely milky quartz

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Opalite

Synthetic opalescent glass

Goldstone

Aventurine glass

Green glass-like mineral specimen, likely fluorite

Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass

Slag

Anthropogenic Iron Silicate Glass

Likely weathered metallic mineral or slag fragment

Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag

Silver (Jewelry form)

Native Silver (Ag)

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Blue cabochon gemstone, likely synthetic glass or dyed stone

Indeterminate from image; possible glass, synthetic spinel, sodalite, or lapis lazuli

Opalite (likely man-made opalescent glass)

Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)

Brick fragment (Man-made material)

N/A (Fired clay)

Man-made Ceramic / Clay Figurine

Aluminosilicate Ceramic (Processed Clay)

Possible meteorite fragment

Undetermined; likely an iron-rich meteorite or meteorite-like slag fragment

Iron-rich meteorite candidate

Unclassified meteoritic iron–stone material; possible stony-iron meteorite or terrestrial ironstone

Polished labradorite sphere

Labradorite, calcic plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Hematite

Iron(III) oxide (Fe2O3)

Red Sandstone or Brick Fragment

Arenite (if sandstone)