Synthetic (Ceramic)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Dumortierite Quartz

Dumortierite in Quartz (SiO2 with Al7BO3(SiO4)3(O,OH)3)

Quartzite (with possible Calcite/Limestone weathering)

Quartzite (primarily SiO2)

Chert (v. Flint)

Sedimentary Cryptocrystalline Quartz (SiO2)

Cabochon-cut ruby (corundum)

Corundum, Al₂O₃; red color is caused mainly by chromium

Likely tumbled hematite-rich ironstone

Hematite, Fe₂O₃, possibly mixed with goethite or magnetite

Iron-stained quartz or chert fragment

Quartz (SiO₂), possibly microcrystalline quartz/chert with limonite staining

Ironstone concretion with iron-oxide/possibly hematite inclusions

Ferruginous sandstone or lateritic ironstone; inclusions likely hematite (Fe₂O₃) and/or goethite (FeO(OH))

Polished jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Weathered iron-rich rock (probable laterite or limonite-bearing stone)

Goethite–limonite mixture, commonly written FeO(OH)·nH₂O, with possible quartz and clay minerals

Earthy Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Pink faceted gemstone, possibly pink sapphire

Uncertain from the image; possibly corundum (Al₂O₃)

Ruby (or potential synthetic/imitation)

Corundum (Al2O3)

Amethyst (likely synthetic or treated)

Purple quartz, SiO₂; color caused mainly by trace iron and irradiation

Likely amethyst crystal fragment

Quartz, SiO₂; purple coloration from iron-related defects and irradiation

Likely weathered iron-rich rock or laterite

Laterite or ferruginous sandstone; commonly dominated by goethite/hematite with quartz and clay minerals

Weathered iron-rich rock, possibly hematite-bearing breccia

Hematite (Fe₂O₃)-rich lithic fragment; exact host rock is uncertain from the image

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Blue-green mineral specimen, likely chrysocolla or turquoise

Chrysocolla: hydrated copper phyllosilicate, approximately Cu₂H₂O₅Si; Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O

White quartzite pebble (tentative)

Quartzite; predominantly microcrystalline quartz (SiO₂)

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Digital Multimeter (Synthetic Object)

Digital Multimeter (DMM)

Green iridescent glass cabochon or synthetic gemstone

Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone

Gem-set gold ring

Unidentified transparent gemstone, possibly quartz or glass, set in a gold-colored metal ring

Black cabochon pendant, likely onyx or black glass

Most likely black chalcedony (microcrystalline quartz, SiO₂); the surrounding stones may be cubic zirconia or glass

Blue faceted gemstone, likely sapphire

Corundum (Al₂O₃), likely blue sapphire; identity cannot be confirmed from the photograph alone

Blue-green faceted gemstone, possibly glass or synthetic material

Not identifiable from the image; possible synthetic spinel or glass

Small stud earring with a purple gemstone (possibly amethyst)

Possible amethyst, a purple variety of quartz (SiO₂); identification is uncertain from the image

Tumbled opalite (likely man-made glass)

Opalite glass; a synthetic opalescent glass, not a natural mineral species

Emerald (cut gemstone)

Beryl, Be₃Al₂Si₆O₁₈, colored green mainly by chromium and/or vanadium

Ametrine

SiO2 (Silicon Dioxide with iron impurities)

Painted Rock

Rock coated with synthetic acrylic paint

Orgonite Pyramid (containing Amethyst and mixed minerals)

Silicon Dioxide (SiO2) in synthetic resin

Opalite

Synthetic Glass (Simulated Moonstone/Opal)

Sedimentary Rock with Crafts (Pet Rock)

Sedimentary rock decorated with synthetic materials

Blue Quartz / Glass Gemstone Pendant

SiO2 (Silicon Dioxide) or Synthetic Glass

Opalite

Synthetic glass (SiO2 + metal additions)

Opalite

Synthetic Opalite (Man-made glass)

Pink Dyed Agate

Silicon Dioxide (SiO2) with synthetic pigment

Dyed Quartzite

Metamorphosed Quartz (SiO2) with synthetic pigment

Synthetic Resin / Plastic Figurine

Synthetic Polymer (Copolymer of Polyethylene or Resin)