Man Made Mineral Simulant (Glass)

Obsidian (likely black volcanic glass)

Obsidian; primarily amorphous volcanic silica glass, approximately SiO₂-rich rhyolitic composition

Transit Token (RTD Denver)

Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Blue goldstone

Man-made aventurine glass containing metallic copper particles; not a natural mineral

Polished white calcite sphere (identification tentative)

Calcite, CaCO₃

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

Opalite

Synthetic glass (Opalite simulant)

Opalite-style pendant (likely synthetic glass, not natural opal)

Opalescent glass; commonly sold as “opalite” (not a recognized mineral species)

White pebble, likely quartz or calcite

Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Diamond

Native Carbon (C)

Faceted clear gemstone in a gold-colored ring

Unidentified colorless faceted gem; possibly quartz, glass, or another transparent gem material

Likely clear quartz crystal or glass-like gemstone

Quartz, silicon dioxide (SiO₂); exact identification is uncertain from the strongly magenta-lit image

Aluminum Slag

Anthropogenic Aluminum (Al)

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching

Opalite

Synthetic glass (SiO2 + metal additions)

Chakra Stone Tower (Composite Multi-Mineral)

Crystalline Silicon Dioxide composite (SiO2) with various inclusions

Asphalt / Road Aggregate

Bituminous Conglomerate (synthetic)

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Crackled Quartz (Dyed)

Silicon Dioxide (SiO2)

Polished black stone, likely obsidian

Obsidian (volcanic glass; mostly silica-rich rhyolitic composition)

Slag

Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)

Libyan Desert Glass

Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)

Titanium-coated Metal Cube (Man-made Fidget Toy)

Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)

Sea Glass (White/Clear)

Amorphous Silica (Alkali-Lime-Silica Glass), SiO2 + Na2O + CaO

Yellow faceted gemstone, likely synthetic cubic zirconia or glass; species cannot be confirmed from the image

Undetermined; possible cubic zirconia (ZrO₂), a manufactured gemstone simulant

Titanium Aura Quartz

Silicon Dioxide (SiO2) coated with Titanium and Niobium

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

Titanium-Coated Hematite (Aura Hematite)

Titanium-bonded Hematite (Fe2O3 with a Ti coating)

Opalite

Synthetic Opalised Glass

Botryoidal chalcedony (likely agate/jasper variety)

Microcrystalline quartz, SiO₂

Concretion with Geode Cavity

Ferruginous Sandstone Concretion with Quartz Center

Tumbled black obsidian (likely)

Volcanic glass; chiefly silica-rich rhyolitic glass (SiO₂)

Green Slag

Anthropogenic Silicate Glass

Obsidian (Blue)

Volcanic Glass (SiO2)

Carborundum

Silicon Carbide (SiC)

Asphalt Chunk (Bituminous Concrete)

Aggregated Bitumen / Artificial Breccia

Opalite

Synthetic Opalised Glass

Blue glassy gemstone cabochon, likely dyed chalcedony or glass

Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)

Engineerged Quartz (Quartz Composite)

SiO2 (Silicon Dioxide) in a polymer resin matrix

Blue cabochon gemstone, likely synthetic glass or dyed stone

Indeterminate from image; possible glass, synthetic spinel, sodalite, or lapis lazuli

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)