Sedimentary (Man Made Composite)

Opalite

Synthetic Opalite Glass / Opalized Glass

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities

Slag (Industrial Byproduct)

Artificial silicate/iron byproduct

Titanium Coated Kyanite (Aura Kyanite)

Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Opalite

Synthetic Opalite (Man-made glass)

Opalite

Man-made Glass (SiO2 + additives)

Transit Token (RTD Denver)

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

Goldstone

Man-made glass with copper inclusions

Blue Slag Glass

Man-made Silicon Dioxide (Amorphous)

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Boxwork or Septarian Concretion

Septarian nodule / Boxwork weathering

Likely iron-rich slag or weathered ironstone fragment

Uncertain; possibly iron oxide–rich material (hematite/goethite) or industrial iron slag

Blue-green faceted gemstone, possibly glass or synthetic material

Not identifiable from the image; possible synthetic spinel or glass

Turquoise cabochon ring

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

Mystic Topaz (Treated Quartz or Topaz)

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating

Opalite

Man-made opalescent glass (SiO2 + metal oxides)

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Faceted clear gemstone in a gold-colored setting

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

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Obsidian

Volcanic glass

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Man-made)

Sea Glass

Man-made vitreous material / Silicon dioxide

Rounded graywacke or sandstone cobble

Lithified clastic sandstone; likely quartz–feldspar–lithic grain aggregate in a silica or calcite matrix

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Concrete with Exposed Aggregate

Anthropogenic conglomerate (Concrete)

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

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

Opalite

Synthetic Glass (Silica-based)

Costume Jewelry with Synthetic Gemstones

Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)

Opaline Glass (Opalite)

Synthetic Silicon Dioxide Glass

Titanium Aura Quartz

Titanium bonded Silicon Dioxide (SiO2 + Ti)

Polished brown jasper (likely brecciated or orbicular jasper)

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

Blue Diamond

Carbon with Boron impurities (C)

Clear Quartz Sphere (Rock Crystal)

Silicon Dioxide (SiO2)

Blue Goldstone

Auraventurine (Synthetic glass with cobalt and copper inclusions)

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Green-and-white terrazzo (likely serpentine/marble aggregate)

Composite decorative stone; probable serpentinite (Mg₃Si₂O₅(OH)₄) with white calcite marble fragments in cementitious matrix

Aura Quartz (Titanium Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti)

Glazed Ceramic Tile

Fused Silicate-Clay composite