Fossilized Bivalve Shell
Class Bivalvia (fossilized)
fossil
Category
Mineral (Silicate Replaced Organic Material)
Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.
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Jasper
Microcrystalline Quartz (SiO2)
Sedimentary/Mineral
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class) - likely Carcharodon or Otodus genus
fossil
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified wood
Silicified wood, commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Polished brecciated jasper
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and dark mineral inclusions
gemstone
Pyrite
Iron Sulfide (FeS2)
mineral
Fossil Shark Tooth
Selachimorpha (Chondrichthyes dental fossil)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Petrified Wood (Black / Carbonized)
Silicon Dioxide (Quartz/Chalcedony replacing Organic Matter)
fossil
Petoskey Stone
Hexagonaria percarinata (Calcite / CaCO3)
fossil
Epidosite with Quartz (Unakite-variant or Jasper)
Epidotized Metasomatite
metamorphic
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)
sedimentary
Sandstone (likely Fossilized Wood or Concrete Simulacrum)
Arenite / Silicified Wood / Anthropogenic Concrete
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Bone
Permineralized Bone (Vertebrate Fossil)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Shark Tooth Fossil
Vertebrate fossilized tooth (Chondrichthyes)
fossil
Petrified Wood / Jasper Chert
Silicified Wood / Microcrystalline Quartz (SiO2)
sedimentary
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Mammoth Tooth
Mammuthus tooth fossil
fossil
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Petrified Wood
Silicified Wood (Permineralized Lycopsid, Conifer, or Hardwood)
fossil
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized bone fragment
Petrified vertebrate bone; mineralized hydroxyapatite replaced or infilled by silica/carbonates
fossil
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Shark Tooth Fossil
Carcharocles megalodon or similar fossilized shark tooth
fossil
Tumbled brown mineral pebble, possibly jasper or weathered quartzite
Indeterminate from the blurred image; likely microcrystalline quartz (SiO₂) if jasper, or quartzite dominated by quartz
mineral
Mosasaur Tooth
Mosasaurus sp.
fossil
Coral Fossil (Scleractinia)
Scleractinia (Order), primarily CaCO3 (Aragonite or Calcite)
sedimentary
Fossil Shark Tooth
Carcharodon or Carcharias fossil (Vertebrate Fossil)
sedimentary