Man Made (Synthetic Rock)

Slag

Metallurgical by-product

Asphalt (Bituminous Pavement)

Bituminous mix (Aggregates with Bitumen binder)

Faceted glass-like gemstone object

Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image

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

Sea Glass

Silicon dioxide (mostly)

Polished green-and-black banded cabochon (likely malachite imitation or dyed agate)

Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass

Goldstone (Red/Brown)

Aventurine Glass (SiO2 with Copper inclusions)

Weathered iron-rich concretion or ironstone nodule

Goethite–hematite limonite concretion (FeO(OH), Fe₂O₃, and hydrated iron oxides)

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Quartz pebble (Quartztite fragment)

Silicon Dioxide (SiO2)

Clear quartz sphere

Quartz (silicon dioxide, SiO₂)

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Loose faceted colorless gemstones, likely quartz or glass-like mineral chips

Most consistent with quartz (SiO₂), though the photograph cannot exclude synthetic cubic zirconia or glass

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Asphalt Chunk (Bituminous Concrete)

Aggregated Bitumen / Artificial Breccia

Stainless Steel (Polished)

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

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Slag

Metallurgical Slag

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Slag Glass (Cullet)

Amorphous Silica (man-made), primarily SiO2 with trace metal oxides

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Conglomerate

Conglomerate Rock (Paraconglomerate)

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Man-made Crystal (Lead Glass)

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

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Red cabochon gemstone ring (likely ruby or red spinel; identity unconfirmed)

Possibly corundum (ruby, Al₂O₃) or spinel (MgAl₂O₄); visual identification alone cannot distinguish these from glass or synthetic stones.

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Moldavite

Tektite (Impact Glass), ~80% SiO2 + Al2O3

Diamond (or Cubic Zirconia simulant)

Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ

Clear quartz tumbled stone

Quartz (silicon dioxide, SiO₂)

Goldstone (aventurine glass)

Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone

Polished black pebble, likely basalt

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Possible obsidian or slag glass

Volcanic glass, primarily SiO₂; alternatively industrial iron-rich glassy slag

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Rock crystal quartz fragments

Quartz (silicon dioxide, SiO₂)

Goldstone (likely blue-free synthetic goldstone pendant)

Synthetic aventurine glass; silica glass with dispersed metallic copper crystals