Man Made Composite (Lithified Equivalent Of Sedimentary)

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Sandstone Concretion

Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)

Sea Glass

Silicon dioxide (mostly)

Concretion

Sedimentary Concretion (Ironstone / Calcite Concretion)

Opalite

Man-made Glass (Synthetic Opalized Glass)

Dyed Agate

Chalcedony (SiO2)

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Blue-green chrysocolla rough specimen

Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite

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)

Onyx (Black) and Mother of Pearl Inlay

Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Unidentified translucent crystal/mineral fragment

Likely quartz (SiO₂), but visual identification is uncertain

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Decorated turquoise-like bead or mineral pendant

Likely turquoise [CuAl₆(PO₄)₄(OH)₈·4H₂O], possibly dyed composite or blue-green jasper

Brick fragment (Man-made material)

N/A (Fired clay)

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

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

Turquoise cabochon ring

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

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

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

Diabase (Dolerite)

Diabase

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 Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Man-made)

Opalite

Synthetic Opalite (Man-made glass)

Opalite

Man-made Glass (SiO2 + additives)

Blue Slag Glass

Man-made Silicon Dioxide (Amorphous)