Celestine (Celestite)
Strontium Sulfate (SrSO4)
mineral
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
Learn about Sedimentary (With Some Aspects Of Mineral Replacement) in the encyclopedia
View all →
Flint
Silicon dioxide (SiO2)
sedimentary
Magnetite (Small Granule)
Magnetite (Fe3O4)
mineral
Chert
Chert (SiO2)
sedimentary
Fossilized shell or small fossil fragment
Indeterminate fossil; possibly a partial gastropod or bivalve, mineralized with calcite
fossil
Unidentified small rocks or gravel
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert
Chert (SiO2)
sedimentary
Fossilized Bivalve Shell
Bivalvia (Phylum Mollusca)
fossil
Fossilized Sand Tiger Shark Tooth
Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)
sedimentary (fossil)
Fossilized tooth or tooth fragment
Indeterminate vertebrate tooth; possibly a fossil shark tooth (Carcharodon/Carcharocles)
fossil
Botryoidal Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Chert (White Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Fossil Snail
Gastropoda fossil
fossil
Jasper
Silicon dioxide (SiO2)
sedimentary
Fossil Brachiopod
Phylum Brachiopoda
fossil
Likely fossil oyster shell
Fossilized bivalve shell; exact species cannot be identified from the image
fossil
Conical fossil shell or shell fragment
Likely a gastropod shell fragment; exact taxon indeterminate from the image
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fluorite
Calcium fluoride (CaF2)
mineral
Megalodon Shark Tooth
Otodus megalodon
fossil
Fossilized Megalodon Tooth Fragment
Otodus megalodon (Carcharocles megalodon fossil)
sedimentary
Fossilized bone, likely a tooth or jaw fragment
Mineralized vertebrate bone; taxonomic identification requires clearer diagnostic anatomy
fossil
Iron-stained fossiliferous rock, possibly fossil wood
Likely silicified/petrified wood in iron-rich silica matrix; exact identification requires microscopy
fossil
Turritella Fossil
Turritella (Class Gastropoda, Family Turritellidae)
fossil
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Polished brecciated jasper
Silicified microcrystalline quartz (chalcedony), commonly called jasper
sedimentary
Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartz-rich)
Arenite (composed primarily of SiO2)
sedimentary
Fossilized bivalve shell fragment
Bivalvia; commonly aragonite or calcite (CaCO₃), often recrystallized during fossilization
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartz (likely Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Chert (Common Opal/Agatized Rock)
Microcrystalline Quartz (SiO2) with potential Chalcedony/Opaline silica
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Fossil oyster shell
Fossilized bivalve shell, likely Ostrea or Crassostrea species; primarily calcite (CaCO₃)
fossil
Bivalve Fossil (Clam Shell)
Class Bivalvia
fossil
Banded Chert
Silicon Dioxide (SiO2) with impurities
sedimentary
Fossilized wood or plant fragment
Petrified wood (silicified fossil wood; commonly Araucarioxylon or related taxa)
fossil
Fossilized shell fragment, likely bivalve
Bivalvia indet.; commonly preserved as calcite (CaCO₃) shell material
fossil