Petrified Wood
Silicified Wood (SiO2)
fossil
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
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Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Polished quartz-rich pebble, possibly jasper or quartzite
Quartzite or chalcedony-bearing jasper; predominantly SiO₂
metamorphic
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Polished green-and-white stone, likely serpentine or nephrite jade
Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (interlocking actinolite–tremolite)
metamorphic
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Flint / Chert
Silicon dioxide (SiO2)
sedimentary
Cubic Zirconia (Diamond Simulant)
Zirconium Dioxide (ZrO2)
mineral
Chert (or Flint)
Chert (a cryptocrystalline variety of quartz, SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Shale (or Mudstone)
Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)
sedimentary
Honey Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral (man-enhanced)
Aura Turquoise or Treated Turquoise Beads
Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O) with metallic coating
gemstone
Shark Tooth Fossil
Selachii fossil
fossil
Fossil Shark Tooth
Chondrichthyes tooth fossil
fossil
Fossil Shell (Bivalve)
Phylum Mollusca, Class Bivalvia
fossil
Fossil Seashell
Invertebrate fossil (Bivalvia)
fossil
Cubic Zirconia (Faceted)
Zirconium dioxide (ZrO2)
gemstone
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Tiger's Eye
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
Mineral (Metamorphic pseudomorph)
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond (or Cubic Zirconia simulant)
C (Carbon) or ZrO2 (Zirconium Dioxide)
gemstone
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Serpentine (Healerite variety)
Serpentine group, Mg3Si2O5(OH)4
metamorphic
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Fossil Shark Tooth
Selachii (fossilized dentition)
fossil
Bivalve Fossil (Fossilized Shell)
Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Chert (specifically Flint or Jasper-Chert)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Greenstone, likely serpentine or green jasper
Serpentine-group minerals, chiefly antigorite/lizardite; possibly quartz-rich jasper
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Native American Hammerstone / Pitted Stone
Modified lithic artifact (often quartzite, basalt, or granite)
artifact / sedimentary or igneous rock
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Dyed Chalcedony (Agate)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Yellow Quartz (Citrine Quartz / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Granite Cobble
Plutonic Igneous Rock (Granitic)
igneous