Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Category
Mineral (Silicate Replaced Organic Material)
Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Fossiliferous Chert (with Fossil Shells)
Silicon Dioxide (SiO2) with biogenic inclusions
sedimentary
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (Nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Fossilized wood (petrified wood), likely silicified
Petrified wood; predominantly microcrystalline quartz (SiO₂) replacing wood tissue
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Flower Jasper
Agatized Fossil Coral / Chalcedony (SiO2)
sedimentary
Fossil Coral (Rugose Coral Fragment)
Rugosa (extinct order of solitary and colonial corals)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of Cellulose)
fossil
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
mineral
Shark Tooth Fossil
Elasmobranchii fossil (likely Carcharias or Odontaspis sp.)
fossil
Chert
Microcrystalline silica (SiO2)
sedimentary
Chert (Flint Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Shark Tooth Fossil
Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class) fossil
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Quartz (Silicon Dioxide) with Hematite inclusions, SiO2
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Sand Tiger Shark Tooth (Fossil)
Carcharias taurus (fossilized dentin/enameloid)
fossil
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Dinosaur Bone (Petrified/Agatized)
Permineralized Dinosauria Bone (Silicate Replacement)
fossil
Dinosaur Bone (Gembone)
Silicified Dinosaur Bone (SiO2 replacing organic tissue)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Mosasaur Tooth Fossil
Mosasaurus sp.
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil