Synthetic (Ceramic)

Ruby / Red Tourmaline

Corundum (Al2O3) or Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)4)

Lepidolite

K(Li,Al)3(Al,Si,4)10(O,F,OH)2

Lepidolite in Mica Schist

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Amazonite with Smoky Quartz and Feldspar

Microcline (KAlSi3O8) with Quartz (SiO2)

Sandstone (Weathered Cobble)

Clastic Sedimentary Rock (primarily SiO2)

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Black Veined Jasper (Spiderweb Jasper)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Weathered iron-rich concretion or ironstone nodule

Goethite–hematite limonite concretion (FeO(OH), Fe₂O₃, and hydrated iron oxides)

Siltstone (Iron-rich)

Ferruginous Siltstone

Blue Kyanite

Kyanite (Al2SiO5)

Orange Quartzite / Quartz River Siltstone

Quartzite (SiO2)

Reddish Brown Claystone or Siltstone

Argillite / Siltstone / Claystone

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

Iron-rich weathered rock (likely limonite/goethite concretion)

Limonite–goethite mixture; chiefly FeO(OH)·nH₂O

Tumbled hematite (likely hematite-rich ironstone)

Hematite, Fe₂O₃; possibly mixed with magnetite or goethite

Iron-rich meteorite candidate

Unclassified iron meteorite, possibly an ordinary chondrite or weathered iron oxide-rich meteorite

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Synthetic Costume Accessory (Non-Geological)

Polyester and Acrylic Fiber (Anthropogenic polymer)

Lapis Lazuli

Lazurite-dominant metamorphic rock, Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Ruby (or potential synthetic/imitation)

Corundum (Al2O3)

Diamond

Natural Diamond (Carbon, C)

Diamond (Cut Gemstone)

Carbon (C)

Note: Item is a Synthetic/Man-made Object

Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)

Synthetic Sapphire and Ion-X Glass

Single-crystal Alumina (Al2O3) and Ion-strengthened Aluminosilicate Glass

Tumbled white quartz or quartzite pebble

Quartz (SiO₂), possibly massive quartzite

Pyrite

Iron Sulfide (FeS2)

Dyed Alum or Dyed Quartz (Ornamental Crystal)

Silicon Dioxide (SiO2) or Potassium Alum [KAl(SO4)2·12H2O]

Ruby

Corundum (Al2O3)

Likely blue glass or synthetic gemstone jewelry

Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass

Lapis Lazuli

Lazurite-dominated metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Digital Multimeter (Synthetic Object)

Digital Multimeter (DMM)

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Crackled Quartz (Dyed)

Silicon Dioxide (SiO2)

Cubic Zirconia

Zirconium dioxide (ZrO2)

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (predominantly Lazurite)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Blue cabochon gemstone, likely sapphire

Corundum (Al₂O₃), blue variety colored mainly by iron and titanium

Corundum (Pink Sapphire / Ruby)

Al2O3 (Aluminum Oxide)