Tumbled chalcedony (likely milky quartz)
Chalcedony, cryptocrystalline SiO₂; possibly quartz-rich chert
mineral
Category
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Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Polished agate/chalcedony pebble
Microcrystalline quartz (SiO₂), likely brecciated or mossy agate
mineral
Staurolite (Fairy Stone)
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Tumbled chalcedony or carnelian
Microcrystalline quartz (SiO₂), likely iron-bearing chalcedony
mineral
Polished carnelian/chalcedony
Carnelian, a red-orange variety of microcrystalline quartz (SiO₂)
gemstone
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Yellow chalcedony (likely heat-treated or resin-coated)
Microcrystalline quartz, SiO₂
mineral
Tumbled amber-colored chalcedony (likely carnelian)
Chalcedony, microcrystalline quartz (SiO₂); orange-red variety called carnelian
mineral
Colorless faceted gemstone, likely cubic zirconia
Cubic zirconia (synthetic ZrO₂), possibly glass or white sapphire
gemstone
Serpentinite
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and talc
metamorphic
Tumbled orange chalcedony or carnelian
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/carnelian
mineral
Chalcedony (likely common gray chalcedony)
Microcrystalline quartz, SiO₂
mineral
Serpentinite
Serpentinite; chiefly serpentine-group minerals (lizardite, chrysotile, antigorite), commonly with magnetite and minor talc
metamorphic
Serpentine (serpentinite)
Serpentine-group minerals, chiefly antigorite, lizardite, and chrysotile: Mg₃Si₂O₅(OH)₄
metamorphic
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N/A
Cubic Zirconia (simulant) or Diamond
ZrO2 (Cubic Zirconia) or C (Diamond)
gemstone
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral (synthetic)
Tiger's Eye (specifically Hawk's Eye or Multicolored Tiger's Iron)
Silicon Dioxide with Crocidolite inclusions (SiO2)
mineral
Banded Agate (variety of Chalcedony)
Agate (SiO2)
mineral
Basalt
Basalt
igneous
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
mineral (synthetic)
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Pink Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Paper (Cellulose)
Cellulose (C6H10O5)n
Organic (Anthropogenic)
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Amber (likely opaque/burnished amber)
Fossilized plant resin; primarily polymerized terpenoid resin (succinite-type amber)
gemstone
Amber (and Cubic Zirconia)
Fossilized Tree Resin
mineraloid
N/A (Non-Geological Object)
N/A
Pink Quartz
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Rose Quartz
Silicon Dioxide (Quartz), SiO2
mineral
Tiger's Eye
Tiger's Eye (SiO2 with crocidolite inclusions)
mineral
Basalt (Weathered)
Mafic Igneous Rock
igneous
Shark Tooth Fossil
Lamniformes (Shark tooth fossil composed of Fluorapatite)
fossil
Pink Quartz
Silicon Dioxide (SiO2)
mineral
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
mineral
Tiger's Eye
Silicon Dioxide (Quartz pseudomorph after crocidolite) - $SiO_2$
mineral
Tiger's Eye
Quartz pseudomorph after crocidolite (SiO2)
gemstone
Tiger's Eye
Silicon Dioxide (Quartz pseudomorph after crocidolite) - SiO2
mineral
Tiger’s-eye
Quartz variety; fibrous pseudomorph of quartz after crocidolite, SiO₂
mineral