Mineral (Man Made Glass)

Aura Quartz (specifically Titanium Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Opalite

Synthetic Opalized Glass

Blue-dyed tumbled quartz or glass imitation

Quartz (SiO₂), appearance possibly enhanced with blue dye; identity uncertain from image

Polished dendritic agate or jasper

Microcrystalline quartz (SiO₂), likely chalcedony with iron/manganese dendrites

Cubic Zirconia (Jewelry Setting)

Zirconium Dioxide (ZrO2)

Blue sea glass or blue glassy mineral fragment

Uncertain; likely man-made soda-lime glass, not a natural mineral

Green glassy mineral fragment, possibly fluorite

Fluorite (calcium fluoride, CaF₂), tentative identification

Cobalt Glass Slug (Cullet)

Man-made Silicate Glass with Cobalt Oxide (CoO)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Slag Glass

SiO2 (Silicon Dioxide) with impurities

Goldstone (brown goldstone)

Man-made aventurine glass, typically copper-bearing silica glass

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Concrete Fragment

Artificial Conglomerate (Cement and Aggregate)

Goldstone

Aventurine glass (Synthetic glass with copper inclusions)

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Concrete

Anthropogenic Conglomerate

Blue glassy fragment among beach gravel

Likely cobalt-blue man-made glass; not a natural mineral specimen

Blue glassy tumbled stone, likely blue chalcedony or slag glass

Chalcedony (microcrystalline SiO₂), possibly man-made blue glass

Raw quartz crystal

Quartz (silicon dioxide, SiO₂), likely milky or included quartz

Asphalt Concrete

Bituminous Concrete (Anthropic Rock)

Ferrochrome Slag

Anthropogenic slag (Fe-Cr alloy waste)

Slag (Industrial Byproduct)

Artificial silicate/iron byproduct

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Goldstone (Brown/Gold)

Aventurine Glass (Man-made glass with Copper inclusions)

Goldstone

Aventurine Glass (Man-made glass with copper inclusions)

Goldstone (Red)

Aventurine Glass (SiO2 + Cu)

Unidentifiable Rock Fragment

Rainbow Hematite Ring

Iron(III) oxide (Fe2O3) with thin-film coating

Man-made Crystal (Lead Glass)

Lead oxide-doped Silica Glass (approx. SiO2 + PbO)

Concrete with Aggregate

Artificial Conglomerate (Cement and Aggregate)

Polished brown jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Goldstone (Brown/Gold variety)

Aventurine Glass (SiO2 with Copper inclusions)

White pebble, likely quartz or calcite

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

Diamond

Native Carbon (C)

Polished black stone, likely black obsidian

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

Transit Token (RTD Denver)

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

Obsidian (likely black volcanic glass)

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

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Aluminum Slag

Anthropogenic Aluminum (Al)

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching