Mineral (Man Made Glass, Not Natural)

Tumbled purple chalcedony or low-grade amethyst bead bracelet

Chalcedony (microcrystalline SiO₂), possibly quartz/amethyst; composition is SiO₂

Asphalt Chunk

Asphalt concrete

Polished black obsidian

Volcanic glass; primarily rhyolitic SiO₂, with minor iron, magnesium, and other trace elements

Smoky Quartz

Smoky Quartz (SiO2)

Weathered iron-rich concretion or ironstone nodule

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

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Rounded quartz pebble

Quartz (silicon dioxide, SiO₂)

Metallic sulfide mineral fragment, likely galena

Galena (lead sulfide, PbS), tentative identification

Corundum (Sapphire variant)

Aluminium oxide (Al2O3)

Dalmatian jasper

Porphyritic microcrystalline quartz-rich rock, commonly sold as Dalmatian jasper; spots are chiefly arfvedsonite/amphibole minerals, sometimes altered feldspar

Beaded gemstone bracelet, likely lapis lazuli and pale quartz/agate

Lapis lazuli: lazurite-rich rock, chiefly (Na,Ca)₈(AlSiO₄)₆(S,SO)₂; pale beads are uncertain

Strawberry Quartz (or Pink Aventurine)

Quartz with Hematite/Goethite inclusions (SiO2)

Amethyst (with Pyrite and other minerals)

Silicon Dioxide (SiO2)

Blue Goldstone

Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Green obsidian (likely moldavite)

Natural volcanic glass; if extraterrestrial-impact glass, moldavite (tektite)

Vesicular basalt (probable iron-rich volcanic rock)

Basalt; chiefly plagioclase, clinopyroxene, olivine, and Fe-Ti oxides

Likely gold-colored metal ring with a possible gemstone

Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting

Diamond Druzy (Crystalline Diamond)

Carbon (C)

Diamond

Diamond (pure native carbon, C)

Goldstone (Red)

Aventurine Glass

Smoky Quartz

Silicon Dioxide (SiO2)

Diamond (in Jewelry Setting)

Carbon (C)

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Diamond

Native Carbon (C)

Diamond (as featured in jewelry)

Diamond (C - pure carbon)

Diamond (Cut jewelry specimen)

Diamond (pure Carbon, C)

Green Slag Glass

Amorphous Silica / Glassy Blast Furnace Slag

Sandstone

Arenite (SiO2 primarily)

Natural Pearl

Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3

Red Sandstone or Brick Fragment

Arenite (if sandstone)

Goldstone (Synthetic Aventurescence Glass)

Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)

Sandstone

Arenite

Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Mixed beach-stone and tumbled-glass collection

Predominantly uncertain rocks (likely basalt, granite, and quartz-bearing stones) with anthropogenic glass; one possible banded agate or jasper

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Carved smoky quartz (likely)

Quartz, silicon dioxide (SiO₂), smoky variety

Yellow faceted gemstone, likely citrine or yellow sapphire

Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)

Ruby in Matrix

Corundum (Al2O3)

Diamond (Cut Gemstone)

Carbon (C)

Turquoise-style beaded bracelet

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads

Polished garnet bead bracelet

Garnet group, likely almandine–pyrope solid solution; commonly approximated as Fe₃Al₂(SiO₄)₃–Mg₃Al₂(SiO₄)₃