Fossil Shell
Brachiopod or Mollusk fossil
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 yellow jasper or silicified rock fragment
Microcrystalline quartz (chalcedony), SiO₂, likely iron-oxide colored
mineral
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossilized Shark Tooth (Otodus)
Otodus obliquus
fossil
Petrified Wood
Silicified Wood (mainly Quartz / SiO2)
fossil
Fossilized Bone Fragment
Vertebrate Fossil
fossil
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Petrified wood (polished/cut slab)
Silicified fossil wood, commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossil Shark Tooth
Selachii fossil
fossil
Chert / Jasper / Agate (Chalcedony Group)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Tumbled jasper or altered chalcedony
Microcrystalline quartz (SiO₂), possibly jasper/chalcedony
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Fossil gastropod shell
Fossilized marine gastropod; exact genus/species cannot be determined from the image
fossil
Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Jasper / Agate with Petrified Wood Inclusion
SiO2
mineral
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
mineral
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
mineral
Fossil Shark Tooth
Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite
fossil
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Petrified Dinosaur Bone (Gembone)
Agatized Dinosaur Bone
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Chalcedony (Agatized Coral / Rough Chalcedony Node)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil