Sedimentary (Synthetic)

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Faceted Gemstone

Unknown transparent mineral, possibly Diamond (C), Cubic Zirconia (ZrO2), Quartz (SiO2), or Glass

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)

Faceted Clear Quartz or Diamond Simulant

Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic

Rainbow Hematite / Magnetic Hematite

Iron oxide (Fe2O3) - often synthetic/coated for beads

Asphalt / Road Aggregate

Bituminous Conglomerate (synthetic)

Faceted Gemstones (Mixed)

Various (e.g., Corundum, Beryl, Quartz, or synthetic equivalents)

Blue cabochon gemstone, likely synthetic spinel or glass

Undetermined; possible synthetic cobalt-blue spinel (MgAl₂O₄) or colored glass

Cubic Zirconia (as used in jewelry setting)

Zirconium dioxide (ZrO2)

Amber (and Cubic Zirconia)

Fossilized Tree Resin

Painted Rock

Weathered Sedimentary Rock (Painted)

Red faceted gemstone, likely synthetic ruby or red glass imitation

Possibly synthetic corundum (Al₂O₃:Cr³⁺); image alone cannot distinguish it from glass or another imitation

Sedimentary Rock with Crafts (Pet Rock)

Sedimentary rock decorated with synthetic materials

Painted River Rock

Painted Quartzite or Smooth Siltstone

Opalite

Synthetic Glass (Simulated Opal)

Black onyx or black obsidian bead bracelet

Likely chalcedony (microcrystalline quartz, SiO₂) if onyx; alternatively volcanic glass (obsidian)

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Pink faceted gemstone, likely synthetic ruby or pink sapphire

Corundum (Al₂O₃), possibly chromium-colored ruby; synthetic origin likely

Milky Quartz

Silicon Dioxide (SiO2)

The user-provided image does not contain a rock or mineral specimen

Iridescent polished gemstone, likely opal

Common or precious opal (hydrated amorphous silica, SiO₂·nH₂O), possibly synthetic or glass imitation

Dyed Agate Slice

Silicon Dioxide (SiO2) with artificial dyes

Coal (Bituminous or Anthracite)

Carbonaceous Sedimentary Rock

Pink Dyed Agate

Silicon Dioxide (SiO2) with synthetic pigment

Opalite

Synthetic Glass (Amorphized Silicon Dioxide)

Opal cabochon or opal-like decorative specimen

Hydrated amorphous silica, SiO₂·nH₂O; likely synthetic or assembled opal material

Man-made Synthetic Material (Costume Faux Fur)

Synthetic Polymer (Polyester/Acrylic)

Cubic Zirconia

Zirconium dioxide (ZrO2)

Opalite

Synthetic Glass (Simulated Moonstone/Opal)

Painted River Rock

Polished fluvial clast with acrylic/synthetic pigment coating

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

Ruby (in costume jewelry context)

Corundum (Al2O3) with Chromium impurities

Unidentified polished dark gemstone cabochon

Possibly hematite, obsidian, jet, or dark agate; image insufficient for a definitive identification

Carnelian

Carnelian (Cryptocrystalline Quartz, SiO2)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Purple cabochon gemstone, likely amethyst or purple sapphire/spinel

Indeterminate from image; possible quartz (SiO₂), corundum (Al₂O₃), or spinel (MgAl₂O₄)

Hematite

Iron(III) oxide, Fe2O3

Loose faceted colorless gemstones, likely quartz or glass-like mineral chips

Most consistent with quartz (SiO₂), though the photograph cannot exclude synthetic cubic zirconia or glass

Opalite (Synthetic Moonstone/Sea Opal)

Silicon Dioxide (SiO2) glass with metallic inclusions

Lava Stone and Chakra Beads

Basalt (with various mineral/synthetic beads)

Cubic Zirconia (simulant) or Diamond

ZrO2 (Cubic Zirconia) or C (Diamond)

Opalite

Synthetic glass / Opalized glass