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)

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Blue-green mineral specimen, likely chrysocolla or turquoise

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

Yellow faceted gemstone, likely citrine or yellow beryl

Quartz (SiO₂), if citrine; beryl (Be₃Al₂Si₆O₁₈), if heliodor

Lapis Lazuli

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

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

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)

Digital Multimeter (Synthetic Object)

Digital Multimeter (DMM)

Costume Jewelry Gemstones (Emerald-imitation and semi-precious beads)

BeCuAl6Si6O18 (Beryl structure), frequently simulated by glass or synthetic spinel

Bouncy Ball (Synthetic Rubber Polymer)

Polybutadiene / Ethylene Vinyl Acetate (EVA)

White quartzite pebble (tentative)

Quartzite; predominantly microcrystalline quartz (SiO₂)

Blue cabochon ring stone, likely sapphire or synthetic blue corundum

Corundum (Al₂O₃), possibly chromium/iron-titanium-bearing sapphire

Corundum (Pink Sapphire / Ruby)

Al2O3 (Aluminum Oxide)

Ametrine

SiO2 (Silicon Dioxide with iron impurities)

Synthetic opal cabochon/bead

Opal-like hydrated amorphous silica; likely lab-created polymer–silica opal or Gilson synthetic opal (SiO₂·nH₂O)

Likely weathered quartz-rich rock

Probably quartz-bearing sandstone or milky quartz; exact identification requires testing

Rounded gray pebble, likely quartz-rich sandstone or chert

Indeterminate lithic clast; possibly quartz arenite (quartz sandstone) or microcrystalline quartz (chert)

Likely blue sapphire ring

Corundum (Al₂O₃), likely sapphire; surrounding stones may be diamonds or colored gems

Milky Quartz

Silicon Dioxide (SiO2)

Red gemstone ring, likely synthetic ruby

Corundum (Al₂O₃), chromium-bearing; possibly lab-created ruby or red glass imitation

Diamond (or Clear Quartz / Cubic Zirconia)

Carbon (C) or Silicon Dioxide (SiO2) / Cubic Zirconia (ZrO2)

Red glass-like crystal, likely synthetic ruby or red glass

Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass

Tumbled milky quartz (likely iron-stained)

Quartz — silicon dioxide (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Lepidolite

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

Milky Quartz

Silicon Dioxide (SiO2)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Chert (concretionary/nodular variant)

Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions

Iron-stained quartz pebble

Quartz (SiO₂), likely limonite/goethite-stained

Iron-rich sandstone (Gozan/Ironstone)

Ferruginous Sandstone (clastic sedimentary rock)

Likely specular hematite

Hematite (Fe₂O₃), probably a micaceous/specular variety

Tumbled white quartz

Quartz (silicon dioxide, SiO₂)

Clay Brick

Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)