Not A Natural Rock (Man Made Composite)

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Acrylic or Resin (Synthetic Imitation)

Polymethyl Methacrylate (PMMA) or Polyepoxide

Diamond

Carbon (C)

Tektite

Natural impact glass

Green Sea Glass

Amorphous Silica (man-made glass), SiO2 + additive metal oxides

Diamond (or Diamond Simulant)

Carbon (C)

Chert

Microcrystalline Quartz (SiO2)

Red jasper pebble

Jasper, an opaque, iron-oxide-colored variety of microcrystalline quartz (SiO₂)

Aura Quartz (Anomalously Coated Quartz)

Silicon Dioxide (SiO2) treated with vaporized metals

Green glassy slag (often sold as “sea glass” or “green obsidian”)

Industrial vitreous slag; primarily amorphous silicate glass, composition variable

Polished turquoise-bearing rock

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a brown host rock or matrix

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Blue Goldstone

Man-made glass with crystalline copper/cobalt inclusions

Green Aventurine

SiO2 (Silicon Dioxide with Fuchsite inclusions)

Slag

Anthropogenic glassy silicate

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Sandstone Pebble

Ferruginous Sandstone (SiO2 with Fe2O3)

Granite

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

Man-made Synthetic Material (Costume Faux Fur)

Synthetic Polymer (Polyester/Acrylic)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Diamond (in a jewelry setting)

Diamond (Carbon, C)

Blue-green cabochon pendant, likely turquoise or composite turquoise

Turquoise: hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification is uncertain from the blurred image

Tumbled chalcedony pendant (likely agate)

Chalcedony, microcrystalline quartz (SiO₂); the pale bands suggest agate

Ruby in Fuchsite (Composite/Stabilized)

Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Purple Turquoise (Composite Mojave Turquoise)

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper aluminum phosphate composite)

Goldstone

Avventurina (Cu + SiO2 glass)

Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)

Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy

Polished turquoise sphere with purple matrix/inclusion

Turquoise, hydrated copper–aluminum phosphate; approximate formula CuAl₆(PO₄)₄(OH)₈·4H₂O

Granite

Granite (Phaneritic Quartz-Feldspar-Mica composite)

Fossiliferous limestone with colonial coral

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

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Libyan Desert Glass

Tektite (high-silica impact glass), SiO2

Polymictic breccia, possibly volcanic breccia

Polymictic clastic breccia; likely a matrix-supported breccia containing lithic fragments, quartz, feldspar, and dark mafic minerals

Carborundum (Silicon Carbide)

Silicon carbide (SiC)

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

Eroded Brick or Pumice-like Scoria

Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)

Sandstone

Arenite (SiO2 based)

Obsidian

Volcanic Glass

White quartz pebble or chip

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Unidentified translucent crystal/mineral fragment

Likely quartz (SiO₂), but visual identification is uncertain

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2