Man Made Glass (Not A Natural Rock Or Mineral)

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Likely polished quartz or glass-like mineral cabochon

Probably quartz (SiO₂), though the image cannot exclude man-made glass

Crushed Stone (Likely Limestone or Granite)

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

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

Ferrous Slag

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

Concrete

Hydrated Portland Cement Aggregate Composite

Concrete or asphalt-like aggregate surface with a dark fragment

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

Diamond (or Diamond Simulant)

Carbon (C)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

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

Green Agate

Silicon dioxide (SiO₂)

Mother of Pearl (Nacre)

Aragonite (CaCO3) with Organic Matrix

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (Chert or Flint)

Asphalt aggregate (crushed stone in bitumen)

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

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Possible weathered basalt or slag fragment

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

Swirled Agate Bead

Silicon Dioxide (SiO2)

Exposed aggregate concrete (stone-chip surface)

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

Sandstone Concretion

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

Tumbled green glassy mineral, possibly aventurine or fluorite

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

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

Polyester (Polyethylene terephthalate) / Faux Fur

Turquoise

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

Tumbled greenstone (likely serpentinite or green jasper)

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

Granite

Intrusive Felsic Igneous Rock (primarily Quartz and Feldspar)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Polished orbicular jasper (likely ocean jasper)

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

Turquoise ring

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

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Dalmatian jasper

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

Chalcanthite (Likely Synthetic/Lab-Grown)

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

Diamond

Native Carbon (C)

Diamond (or Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Ferro-silicate Slag

Industrial Vitrified Slag (High-silica amorphous glass)

Acrylic or Resin (Synthetic Imitation)

Polymethyl Methacrylate (PMMA) or Polyepoxide

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

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

Yellow Sapphire (Raw)

Corundum (Al2O3)

Polished black stone, likely black obsidian

Obsidian (volcanic glass), chiefly silica-rich rhyolitic composition

Diamond (in a jewelry setting)

Carbon (C)

Labradorite

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

Glass / Silicon Dioxide (Man-made)

SiO2 (Amorphous Silicon Dioxide)

Blue Goldstone

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