Chert Nodule
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Category
Organic Material
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Yellow Jasper
Silicon Dioxide (SiO2)
mineral
Black Jasper
Black Jasper (Silicate mineral - SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Polished banded agate (likely picture jasper or petrified wood)
Microcrystalline quartz, SiO₂, with iron-oxide and clay inclusions
gemstone
Yellow Jasper
Silicon Dioxide (SiO₂)
sedimentary
Shark Tooth Fossil
Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (class) fossilized tooth
fossil
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Chert (Jasper nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Dinosaur Bone
Agatized Dinosaur Bone
sedimentary/fossil
Chert (Cherty Shale / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Yellow/Honey Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Ironstone Concretion (Iron-rich Mudstone)
Siderite / Geothite concretion (FeCO3 / FeO(OH))
sedimentary
Yellow Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 principal component)
sedimentary
Chert (and Petrified Wood)
Silicon Dioxide (SiO2)
sedimentary
Fossil Coral (Rugose Coral Fragment)
Rugosa (extinct order of solitary and colonial corals)
sedimentary
Tumbled yellow jasper or silicified rock fragment
Microcrystalline quartz (chalcedony), SiO₂, likely iron-oxide colored
mineral
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Mammoth or Mastodon Tooth Fossil
Proboscidea tooth (Mammuthus or Mammut)
fossil
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
fossil
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (often called Jasper or Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossil-bearing sedimentary rock, possibly fossil wood or bone
Indeterminate silicified/carbonate fossil in sandstone or mudstone
fossil
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Elephant Skin Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Fossilized Horse Tooth
Equus sp. (fossilized molar)
fossil
Sandstone (Ferruginous)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions
mineral
Travertine (Tufa)
Chemical Sedimentary Rock (CaCO3)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary