Sedimentary (Man Made)

Opalite

Man-made Glass (Synthetic Opalized Glass)

Dyed Agate

Chalcedony (SiO2)

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Sandstone Concretion

Sedimentary Clastic Rock (Silicate-rich)

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Stainless Steel (Polished)

Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Asphalt (Bituminous Pavement)

Bituminous mix (Aggregates with Bitumen binder)

Unidentified translucent crystal/mineral fragment

Likely quartz (SiO₂), but visual identification is uncertain

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt

Magnetic Hematite (Man-made)

Iron Oxide (Fe2O3) with Barium-Strontium Ferrite

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Brick fragment (Man-made material)

N/A (Fired clay)

Titanium Coated Kyanite (Aura Kyanite)

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

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

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Porcelain Tile (Sandstone-look)

Man-made Ceramic (resembling Quartz-rich Sandstone)

Boxwork or Septarian Concretion

Septarian nodule / Boxwork weathering

Transit Token (RTD Denver)

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

Mystic Topaz (Treated Quartz or Topaz)

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

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Man-made)

Blue Slag Glass

Man-made Silicon Dioxide (Amorphous)

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

Opalite

Synthetic Opalite (Man-made glass)

Opalite

Man-made Glass (SiO2 + additives)

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)

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

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

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

Concrete with Exposed Aggregate

Anthropogenic conglomerate (Concrete)