Petrified Wood
Fossilized Wood (SiO2 replacing organic matter)
fossil
Category
Mineral (Silicate Replaced Organic Material)
Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.
Learn about Mineral (Silicate Replaced Organic Material) in the encyclopedia
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Tumbled Jasper and Tiger's Eye
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Fossilized Shark Tooth (Eroded)
Carcharodon sp. or Otodus sp. fragment (likely)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Chert Nodules in Sedimentary Rock
Microcrystalline Quartz (SiO2) within Clastic Matrix
sedimentary
Sand Tiger Shark Tooth
Carcharias taurus
fossil
Agatized fossil nodule, possibly silicified wood or bone
Microcrystalline quartz (chalcedony), SiO₂, replacing fossil material
fossil
Fossil Plant Impression (Calamites)
Calamites sp. (Tracheophyta: Equisetopsida)
sedimentary
Vivianite
Vivianite, Fe2+3(PO4)2·8H2O
mineral
Petrified Wood
Silicified wood (SiO2 - Silicon Dioxide)
sedimentary
Chert (specifically Yellow/Honey Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (often called Jasper in this color variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Tiger Shark Tooth
Galeocerdo cuvier (fossilized hydroxylapatite)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Petrified Wood (Silicified Wood)
Silicified Wood / Silicon Dioxide (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Jasper (Petrified Wood Variety)
Silicon Dioxide (SiO2)
sedimentary
Stromatolite (Jasper-replaced)
Fossilized Stromatolite (Cyanobacteria / Cryptozon / Silica SiO2)
sedimentary
Chert (Jasper-bearing)
Microcrystalline silica (SiO2) with iron oxide inclusions
sedimentary
Chert (Green Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Rugose Coral (Horn Coral)
Order Rugosa (extinct coral)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified Wood (Per mineral content: SiO2, Quartz/Chalcedony)
fossil
Petrified Wood
Silicified wood (primarily Quartz, SiO2)
fossil
Petrified Wood
Silicified wood (primarily Quartz/Chalcedony, SiO2)
metamorphic
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chert (Flint)
Chert (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Polished petrified wood
Silicified wood; predominantly microcrystalline quartz (SiO₂), often chalcedony
fossil
Fossilized Shark Tooth (Anterior/Lateral)
Otodus megalodon or Carcharodon carcharias (fossilized)
fossil
Chert (specifically Flint or Jasper variant)
Microcrystalline quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (principally Silicon Dioxide, SiO2)
sedimentary
Fossilized Tooth Fragment
Vertebrate Fossil (Mammalia indet.)
fossil
Chert (Flint/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil