Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
Learn about Organic Specimen (Fossil) in the encyclopedia
View all →
Fossilized wood (petrified wood), likely silicified
Petrified wood; predominantly microcrystalline quartz (SiO₂) replacing wood tissue
fossil
Mosasaur Tooth Fossil
Mosasaurus sp.
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Siderite Concretion in Shale
Iron carbonate (FeCO3) in Mudstone/Shale matrix
sedimentary
Fossiliferous Limestone (Crinoidal)
Calcite-bearing bioclastic packstone (CaCO3)
sedimentary
Agatized Fossil or Chalcedony Nodule
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Fossiliferous Limestone (Coquina)
Calcite (CaCO3) with Bioclastic inclusions
sedimentary
Seashell Fossil
Gastropoda fossil
fossil
Fossiliferous Limestone
Limestone (CaCO3 with Limonite/Goethite staining)
sedimentary
Fossiliferous Shale
Carbonaceous Shale (with potential plant/aquatic fossils)
sedimentary
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Amber Dragonfly Brooch
Succinited (Baltic Amber)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) fossil
fossil
Amber
Succinite (Approximate formula: C10H16O)
mineral
Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Possible fossilized bone or tooth fragment
Indeterminate fossilized vertebrate material; mineralized hydroxyapatite replaced or coated by silica/carbonate
fossil
Amber
Succinite (C10H16O)
mineraloid
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert Concretion
Microcrystalline Quartz (SiO2) in Carbonate Matrix
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Amber
Resinite / Fossilized Tree Resin
mineral
Fossiliferous Limestone
Calcite (CaCO3) matrix with biogenic fragments
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Fossiliferous Limestone / Fossil Fragment
Calcium Carbonate (CaCO3) with indeterminate biogenic remains
fossil
Polished fossilized wood (petrified wood), likely agatized
Silicified wood; predominantly microcrystalline quartz/chalcedony (SiO₂), with iron-oxide coloration
fossil
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Fossilized Shark Tooth
Chondrichthyes (class) fossilized tooth
fossil
Fossilized Wood / Petrified Wood
Petrified Wood (Silicified Flora)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Probable fossil-bearing rock or mineral concretion
Unidentified carbonate-rich concretion with a possible fossil inclusion
fossil
Petrified Wood (Silicified Wood)
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
mineral
Starfish Fossil
Asteroidea fossil
fossil
Fossiliferous limestone, possibly coral-bearing
Calcitic limestone (mostly CaCO₃; fossil fragments may include ancient colonial coral or shell material)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Knightia Fossil in Limestone
Knightia eocaena in micritic limestone
sedimentary