Man Made Mineral Simulant (Glass)

Chert

Silicon dioxide (SiO2)

Tektite

Natural impact glass

Chalcedony (possibly agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Pale green aventurine (likely quartz) sphere

Quartz, SiO₂; possibly pale green aventurine, with color from inclusions or treatment

Chert / Flint

Microcrystalline Quartz (SiO2)

Corundum (Sapphire variant)

Aluminium oxide (Al2O3)

Pink Granite

Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

Brown chert (flint)

Microcrystalline quartz (SiO₂), commonly called chert; “flint” is a dark variety

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Goldstone (Red)

Aventurine Glass

Jasper Marble

Silicon Dioxide (SiO2) with Impurities

Diamond (or Cut Gemstone / Cubic Zirconia)

Carbon (C)

Cubic Zirconia (Simulated Diamond)

Zirconium Dioxide (ZrO2)

Rough Corundum (Sapphire/Ruby mixture)

Corundum (Aluminum Oxide, Al2O3)

Quartz (likely Chalcedony or Chert)

Silicon Dioxide (SiO2)

Tumbled chalcedony or quartz pebble

Microcrystalline quartz, SiO₂ (likely chalcedony); exact identification is uncertain from the image

Chalk

Calcium Carbonate (CaCO3)

Obsidian

Obsidian (Volcanic Glass)

Granite

Felsic intrusive igneous rock

Aura Quartz / Rainbow Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Tourmalinated quartz point

Quartz (SiO₂) containing black tourmaline, usually schorl (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Diamond (in jewelry setting)

Diamond (C - Carbon)

Beaded gemstone jewelry (likely amethyst, lapis lazuli, and pearl or glass imitation)

Mixed mineral beads; possible quartz (SiO₂) and lazurite-bearing lapis lazuli

Aragonite

Aragonite (Calcium Carbonate - CaCO3)

Dyed Pink Quartzite (Jadeite Simulant)

Silicon Dioxide (SiO2) with organic dye

Blue Goldstone

Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)

Colorless faceted gemstone, likely cubic zirconia

Cubic zirconia (synthetic zirconium dioxide, ZrO₂); possibly colorless quartz or laboratory diamond

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Green Slag Glass

Amorphous Silica / Glassy Blast Furnace Slag

Gem-set gold ring

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

Polished black stone pendant

Likely black obsidian or black tourmaline; exact identification is uncertain from the photograph

Smoky Quartz

Smoky Quartz (SiO2)

Chalcedony (Agate / Jasper Specimen)

Silicon Dioxide (SiO2)

Botryoidal chalcedony with iron-oxide staining

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony

Greenstone / Serpentinite

Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn silicate minerals including Antigorite, Lizardite, and Chrysotile)

Polished black stone sphere (likely black basalt or black tourmaline)

Most likely fine-grained basalt (plagioclase–pyroxene); mineral identification is uncertain from the image alone

Turquoise-style beaded bracelet

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

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Decorative gemstone-chip jewelry (likely turquoise, coral, and assorted beads)

Predominantly turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; other pieces appear to be dyed coral or red stone, and possibly shell/metal components

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass (70% or more SiO2)