Man Made Material, Not A Natural Rock Or Mineral Specimen

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Man-made)

Opalite

Synthetic Glass (typically Silica/Magnesium based with metal additives)

Opalite

Synthetic Glass, SiO2 base with metallic inclusions

Goldstone

Avventurina (Cu + SiO2 glass)

Opalite

Man-made Glass (Synthetic Opalized Glass)

Note on Image Identification: Textile

N/A (Anthropogenic material)

Sea Glass

Silicon dioxide (mostly)

Polished dendritic agate or jasper

Microcrystalline quartz (SiO₂), likely chalcedony with iron/manganese dendrites

Libyan Desert Glass

Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)

Sandstone

Arenite (SiO2 primarily)

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

White quartz pebble

Quartz (SiO₂), likely milky quartz

Goldstone (blue/black aventurine glass)

Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions

Transit Token (RTD Denver)

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

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Sandstone

Arenite (variable SiO2 composition)

Sandstone (likely Quartzose Sandstone)

Arenite

Tektite

Impactite (Natural Silicate Glass)

Sea Glass

Man-made vitreous material (silica-based glass)

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Blue Goldstone

Synthetic glass with cobalt and copper inclusions

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Black-and-white agate geode pendant

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

Hematite

Iron(III) oxide (Fe2O3)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Blue opalite (often sold as synthetic opal)

Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)

Polished black stone carving, likely soapstone/steatite

Steatite (massive talc), Mg₃Si₄O₁₀(OH)₂; exact material cannot be confirmed from the image

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Corundum (Pink Sapphire / Ruby)

Al2O3 (Aluminum Oxide)

Tumbled opalite (likely man-made glass)

Opalite, a trade name for opalescent glass; not natural opal

Sandstone

Clastic sedimentary rock (Quartz arenite/Arkose)

Chalcanthite (Likely Synthetic/Lab-Grown)

Hydrated copper(II) sulfate (CuSO4·5H2O)

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Sandstone Concretion

Sedimentary Clastic Rock (Silicate-rich)

Sandstone Concretion

Clastic Sedimentary Concretion (SiO2 with Iron Oxide)

Angular gray rock fragments

Unidentified fine-grained rock; the image does not show diagnostic features sufficient for a specific identification

Rock crystal (clear quartz), possibly cloudy quartz

Quartz, silicon dioxide (SiO₂)

Concretion

Sedimentary Concretion (Ironstone / Calcite Concretion)