Not A Rock (Man Made Industrial Metal)

Boxwork or Septarian Concretion

Septarian nodule / Boxwork weathering

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)

Asphalt (Bituminous Pavement)

Bituminous mix (Aggregates with Bitumen binder)

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Sea Glass

Silicon dioxide (mostly)

Blue crystal pendant (likely blue glass or synthetic crystal)

Not identifiable from the image; possibly synthetic quartz or glass, rather than a natural mineral

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Decorative mosaic cross containing mixed rock and glass fragments

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

Ferro-silicate Slag

Industrial Vitrified Slag (High-silica amorphous glass)

Iron meteorite fragment

Fe-Ni meteorite, likely an iron meteorite or stony-iron fragment

Black-and-white agate geode pendant

Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz

Cullet (Slag Glass)

Amorphous Silica (Industrial byproduct)

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Granite

Intrusive Igneous Rock (Granitic)

Clear quartz sphere

Quartz (silicon dioxide, SiO₂)

Asphalt Chunk (Bituminous Concrete)

Aggregated Bitumen / Artificial Breccia

Carborundum

Silicon Carbide (SiC)

Blue tumbled glass-like specimen; likely blue slag glass

Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Conglomerate

Conglomerate Rock (Paraconglomerate)

Opalite

Synthetic Opalite Glass

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Green Glass Cullet / Recycled Glass

Amorphous Silicon Dioxide (SiO2) with various metal oxides

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Black onyx bead necklace

Black chalcedony, a microcrystalline quartz variety (SiO₂); beads may be dyed or treated

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Moldavite

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

Green Glass (often marketed as 'Obsidian' or 'Green Quartz')

Amorphous Silica (SiO2) with copper or chromium additives

Iron Slag

Anthropogenic Iron Silicate

Amber-set ring

Amber (fossilized plant resin; organic mineraloid), set in a metal ring

Polished dendritic agate cabochon (likely agate or jasper)

Microcrystalline quartz, SiO₂, commonly chalcedony with iron-oxide inclusions

Iron-rich meteorite fragment (probable stony-iron or iron meteorite)

Unclassified Fe–Ni meteorite; possible weathered iron meteorite

Goldstone (Red/Brown)

Aventurine Glass (SiO2 with Copper inclusions)

Rock crystal quartz fragments

Quartz (silicon dioxide, SiO₂)

Concrete with Exposed Aggregate

Anthropogenic conglomerate (Concrete)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Note: This is a Man-Made Object (Costume/Prop Patch)

Synthetic fiber and pigments (Cellulose/Plastic-based composite)

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