Man Made Byproduct (Non Geological)

Yellow chalcedony (likely lemon agate or yellow jasper)

Microcrystalline quartz, SiO₂; possibly iron-bearing jasper or chrysoprase-like chalcedony

Red Sandstone

Quartz Arenite (iron-stained) / SiO2

Sandstone

Sedimentary Clastic Rock (Quartzose Sandstone)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Red/Brown Variety)

Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)

Smoky Quartz

Silicon Dioxide (SiO2)

Granite

Granite (Silicic Intrusive Igneous Rock)

Asphalt Pavement (with aggregate)

Asphalt concrete

Cardstock (Paper)

Cellulose (C6H10O5)n

Polished banded jasper (likely red jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides; exact variety uncertain

Quartzite

Metamorphic Quartzite (SiO2)

Blue chalcedony cabochon (probable)

Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂

Goldstone (blue-goldstone–style glass) beads

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

Dolerite (Diabase)

Dolerite / Diabase

Chert

Microcrystalline quartz (SiO2)

Diamond (in a jewelry setting)

Cubic Carbon (C)

Weathered sandstone fragment

Sandstone, chiefly quartz (SiO₂) with feldspar and iron-oxide cement

Banded Chert

Microcrystalline Quartz (SiO2)

Quartz Geode with Calcite

Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)

Green iridescent glass cabochon or synthetic gemstone

Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone

Granite

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Likely ironstone or ferruginous sandstone fragment

Iron-oxide-cemented sandstone; commonly quartz grains cemented by hematite/goethite (composition cannot be confirmed from the image)

Blue polished cabochon, likely dyed agate or chalcedony

Chalcedony (microcrystalline quartz, SiO₂); exact material cannot be confirmed from the image

Chert (variations include Flint/Jasper)

Cryptocrystalline Quartz (SiO2)

Concretion or weathered iron-rich rock

Likely limonite/goethite-rich concretion; exact identification requires testing

Sandstone

Arenite (composed primarily of Quartz: SiO2)

N/A (Non-Geological Object)

Green aventurine bead jewelry

Quartz (SiO₂), commonly with fuchsite or other mica inclusions

Sea Glass

Amorphous Silicon Dioxide (SiO2)

Crackle Glass (Simulated Gemstone)

Amorphous Solid (SiO2)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Blue Goldstone

Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)

Blue Goldstone

Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)

Porcelain (Stoneware Ceramic)

Mullite / Silica-glass composite (Al6Si2O13)

Goldstone (Brown)

Aventurine glass

Sandstone (Quartzose)

Sandstone (SiO2 dominated)

Blue-green chrysocolla rough specimen

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

Colorless faceted gemstone, likely glass or quartz

Uncertain; possibly quartz (SiO₂), but the strong uniform brilliance and apparent molded/faceted form may indicate leaded glass or cubic zirconia

Galena (lead sulfide)

Galena, PbS

Flint (chert), likely a worked stone flake

Microcrystalline quartz (SiO₂); cryptocrystalline variety of quartz

Carved red jasper bead (likely ceramic imitation)

Jasper, microcrystalline quartz (SiO₂); exact material uncertain from the image

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)