Man Made Glass (Not A Natural Rock Or Mineral)

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

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Slag Glass (Cullet)

Amorphous Silica / Glass residue

Colorless faceted gemstone, likely glass or cubic zirconia

Uncertain; possible cubic zirconia (ZrO₂) or quartz (SiO₂), but the image may show a man-made simulant

Granite

Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)

Fossiliferous limestone with colonial coral

Calcite (CaCO₃) limestone containing fossil tabulate or rugose coral colonies

Sandstone

Arenite (SiO2 based)

Vesicular basalt (probable iron-rich volcanic rock)

Basalt; chiefly plagioclase, clinopyroxene, olivine, and Fe-Ti oxides

Crushed Stone (Likely Limestone or Granite)

Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite

Carborundum (Silicon Carbide)

Silicon carbide (SiC)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Ferrous Slag

Iron/Steel Slag (Complex Calcium-Alumino-Silicates)

Diamond (in a cluster setting)

Crystallized Carbon (C)

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Diamond (or Diamond Simulant)

Carbon (C)

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (Chert or Flint)

Concrete

Hydrated Portland Cement Aggregate Composite

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Mother of Pearl (Nacre)

Aragonite (CaCO3) with Organic Matrix

Tumbled green glassy mineral, possibly aventurine or fluorite

Uncertain; likely quartz variety (aventurine quartz, SiO₂) or green fluorite (CaF₂)

Green Agate

Silicon dioxide (SiO₂)

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

Man-made Synthetic Material (Not a rock or mineral)

Polyester (Polyethylene terephthalate) / Faux Fur

Tumbled greenstone (likely serpentinite or green jasper)

Serpentinite, commonly dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing

Exposed aggregate concrete (stone-chip surface)

Portland-cement concrete containing natural aggregate; not a natural rock

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Swirled Agate Bead

Silicon Dioxide (SiO2)

Granite

Intrusive Felsic Igneous Rock (primarily Quartz and Feldspar)

Glass / Silicon Dioxide (Man-made)

SiO2 (Amorphous Silicon Dioxide)

Sandstone Concretion

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

Blue Goldstone

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

Dalmatian jasper

Porphyritic microcrystalline quartz-rich rock, commonly sold as Dalmatian jasper; spots are chiefly arfvedsonite/amphibole minerals, sometimes altered feldspar

Possible weathered basalt or slag fragment

Basalt, chiefly plagioclase and pyroxene; identification is uncertain from the image

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Red glass-like crystal, likely synthetic ruby or red glass

Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass

Turquoise ring

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; the setting appears to be silver-colored metal

Gem-set gold ring

Unidentified transparent gemstone, possibly quartz or glass, set in a gold-colored metal ring

Polished orbicular jasper (likely ocean jasper)

Siliceous microcrystalline quartz/chalcedony with iron-oxide and volcanic inclusions; commonly called ocean jasper