Petrified Wood
Silicified wood (primarily Quartz/Chalcedony, SiO2)
mineral
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
View all →
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline to cryptocrystalline quartz (SiO2)
sedimentary
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Fossilized Shark Tooth
Elasmobranchii gen. sp. indet. (Calcium Phosphate - Ca5(PO4)3(OH,F,Cl))
fossil
Green Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Jasper with Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood (SiO2)
Mineral / Fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (often found as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Possible fossilized bone or tooth fragment
Indeterminate fossilized vertebrate material; mineralized hydroxyapatite replaced or coated by silica/carbonate
fossil
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Petrified Wood
Silicified Wood / Xylopal (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Chert (Jasper/Limonitic Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz, Chalcedony, or Opal)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Polished banded agate (likely picture jasper or petrified wood)
Microcrystalline quartz, SiO₂, with iron-oxide and clay inclusions
gemstone
Petrified Wood
Silicified Wood (SiO2)
fossil
Jasper (Petrified Wood variant)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Agatized Dinosaur Bone
Permineralized Dinosaur Bone (Silicified/Agatized Bone)
fossil
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Fossilized Shark Tooth (Basal Bone)
Otodus sp. (Mineralized Hydroxyapatite)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Paleoxylon (primarily SiO2)
sedimentary
Polished ocean jasper (orbicular jasper), probable
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions
mineral
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
sedimentary
Petrified Wood
Silicon Dioxide (SiO2) - Calcified / Silicified Wood
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities, microcrystalline quartz
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony replacing $SiO_2$)
sedimentary
Petrified Wood
Silicified Paleoxylon (SiO2)
fossil
Fossilized Coral (Petrified Coral)
Lithostrotionella (example genus) / Scleractinia
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil