Anthropogenic (Man Made Material Mimicking Sedimentary Rock)

Sandstone Concretion

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

Chert

Silicon dioxide (SiO2)

Blue Goldstone

Aventurine Glass

Sandstone

Arenite (SiO2 based clastic rock)

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Sandstone (Quartzose)

Arenite (primarily SiO2)

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Man-made earbud charging case (Not a rock or mineral)

Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

White sea glass (naturally frosted glass fragment)

Man-made silicate glass, typically soda-lime glass; not a mineral or rock

Likely flint (dark chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Goldstone

Avventurina (Man-made Glass with Copper inclusions)

Green obsidian (likely molded or heat-treated glass-like specimen)

Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)

Magnetic Hematite (Man-made)

Iron Oxide (Fe2O3) with Barium-Strontium Ferrite

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Sandstone

Sedimentary Rock (Quartz arenite)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartz Arenite)

Sandstone (dominated by SiO2 quartz grains)

Opalite

Man-made opalescent glass (SiO2 + metal oxides)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Slate

Metamorphic Pelitic Rock

Chert (Flint)

Silicon dioxide (SiO2)

Blue glassy gemstone cabochon, likely dyed chalcedony or glass

Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)

Polished white chalcedony or quartz pendant

Microcrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image

Blue opal heart cabochon

Common opal, hydrated amorphous silica (SiO₂·nH₂O), likely blue-dyed or synthetic opalite

Tumbled milky chalcedony (likely common opal or quartz-rich chalcedony)

Chalcedony, microcrystalline SiO₂; identification is uncertain from the photo

Quartz Geode (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony

Chert (White Chert/Flint)

Microcrystalline Quartz (SiO2)

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

Cultured Marble (Synthetic)

Polymer-matrix composite (typically calcium carbonate in polyester resin)

Slag

Ferrous Slag (Siliceous industrial waste)

Tumbled milky chalcedony (likely common opalite-like quartz)

Chalcedony, microcrystalline SiO₂; possibly pale common opal, hydrated SiO₂·nH₂O

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Sandstone

Sandstone (Quartz-rich Arenite / SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Rock crystal (clear quartz), possibly cloudy quartz

Quartz, silicon dioxide (SiO₂)

Synthetic Resin / Plastic Figurine

Synthetic Polymer (Copolymer of Polyethylene or Resin)

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