Mineraloid Like Synthetic Material

Opalite glass sphere (likely synthetic imitation)

Man-made opalescent glass; not natural opal

Green aventurine bead (likely)

Quartz, SiO₂, with green fuchsite inclusions

Coal (Bituminous or Anthracite)

Carbonaceous Sedimentary Rock

Obsidian

Volcanic glass

Snowflake Obsidian

Volcanic glass containing Spherulites (SiO2)

Blue glassy mineral specimen, possibly dyed or synthetic

Uncertain; possible blue fluorite (CaF₂), dyed chalcedony, or man-made glass

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Emerald

Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium

Obsidian

Volcanic Glass (Amorphous Silica)

Obsidian

Volcanic Glass

Blue Sapphire

Corundum (Al2O3)

Cubic Zirconia (CZ)

Zirconium dioxide (ZrO2)

Diamond (Faceted Gemstone)

Native Carbon (C)

Blue Dyed Agate

Cryptocrystalline Quartz (SiO2)

Likely citrine or yellow glass imitation in a silver-tone bracelet

Citrine: quartz, SiO₂; exact material cannot be confirmed visually

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Turquoise ring

Turquoise, hydrated copper–aluminum phosphate (CuAl₆(PO₄)₄(OH)₈·4H₂O)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Pearl

Calcium Carbonate (Aragonite or Calcite) and Conchiolin

Faceted gemstone ring, likely smoky quartz or garnet in a metal setting

Not determinable from the photograph; possible quartz (SiO₂) or garnet-group silicate

Turquoise-colored ring stone (possibly turquoise or imitation)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; identity cannot be confirmed from the image

Diamond (or Diamond Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Obsidian

Obsidian (Volcanic Glass)

Faceted clear gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂); exact identification requires refractive-index and hardness tests

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Obsidian

Volcanic Glass (Silica-rich glass)

Emerald

Beryl, Be₃Al₂(SiO₃)₆, colored green mainly by chromium and/or vanadium

Faceted gemstones, likely assorted quartz or glass-like gems

Not determinable from the photograph; possible quartz (SiO₂), topaz, or synthetic cubic zirconia

Opalite crescent pendant

Opalite (man-made opalescent glass; not a natural mineral)

Pink faceted gemstone, likely synthetic cubic zirconia or pink sapphire

Uncertain from image; possible zirconium dioxide (cubic zirconia, ZrO₂) or corundum (pink sapphire, Al₂O₃)

Colorless faceted gemstone (likely cubic zirconia)

Cubic zirconia, ZrO₂ (synthetic zirconium dioxide); possibly synthetic glass or lab-grown diamond

Pearl

Organic Mineraloid (CaCO3 + Conchiolin)

Ruby (Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Tumbled dalmatian jasper (likely)

Microcrystalline quartz/chalcedony with black amphibole or aegirine inclusions; commonly sold as “dalmatian jasper”

Obsidian

Obsidian (Amorphous volcanic glass, SiO2 with impurities)

Dyed Agate Geode

Silicon Dioxide (SiO2) with artificial pigment

Iridescent silicon carbide (carborundum) crystal

Synthetic silicon carbide (SiC), likely a moissanite/carborundum specimen

Bismuth Crystal

Bismuth (element symbol Bi, atomic number 83)

Red gemstone ring, likely synthetic ruby or red spinel

Ruby: corundum (Al₂O₃); spinel: MgAl₂O₄; exact identity requires testing

Tumbled black stone, likely black obsidian

Obsidian — natural volcanic glass, primarily SiO₂

Clear Quartz (Faceted) / White Sapphire / Goshenite

Silicon Dioxide (SiO2) / Aluminium Oxide (Al2O3)

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy