Petrified Wood
Silicified Wood (SiO2)
sedimentary
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 (Quartz/Chalcedony/Opal)
sedimentary
Polished amber-like chalcedony/jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony or jasper; amber cannot be confirmed visually
mineral
Megalodon Shark Tooth (Partial Fossil)
Otodus megalodon (fossilized in Calcium Phosphate/Apatite)
Mineral/Fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized wood (petrified wood)
Silicified fossil wood; commonly quartz/chalcedony (SiO₂) replacing wood
fossil
Polished chrysocolla cabochon
Chrysocolla, hydrated copper aluminum silicate; commonly mixed with malachite, quartz, or turquoise
mineral
Mixed Quartz and Jasper Pebbles
Silicon Dioxide (SiO2)
Mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Weathered fossilized wood (likely petrified wood)
Silicified wood; commonly quartz/chalcedony replacing wood tissue (SiO₂)
fossil
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Chert (containing small fossils)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Polished/tumbled jasper, likely ocean jasper or brecciated jasper
Jasper: microcrystalline quartz (SiO₂) with iron oxides and other silicate impurities
mineral
Crinoid Stem Fossil (Indian Bead)
Crinoid ossicle (Echinodermata)
fossil
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Agatized Fossil or Chalcedony Nodule
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert (Common Opal/Jasper mix)
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert Nodules (with Flint core)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Polished banded jasper (likely ocean jasper or brecciated jasper)
Microcrystalline quartz/chalcedony, SiO₂, with iron oxides and assorted silicate inclusions
mineral
Fossil-bearing ironstone or weathered concretion
Indeterminate; likely ferruginous sandstone/concretion containing a partial fossil impression
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Wood (Petrified Wood)
Agatized wood (primarily SiO2)
fossil
Fossilized Shark Tooth
Scapanorhynchus (Sand Tiger Shark relative)
sedimentary
Mosasaur Tooth Fossil
Mosasaurid vertebrate fossil (Hydroxyapatite)
mineral
Fossilized wood fragment
Petrified wood; commonly silicified fossil wood (SiO₂ replacing organic tissue)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood Agate
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Agatized Petrified Wood
Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood
metamorphic
Tumbled jasper (likely brecciated or iron-rich jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides and possibly other silicates
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (Quartz, SiO2)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary