Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
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Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite (Pseudomorph)
Iron Sulfide (FeS2)
mineral
Sandstone (Siltstone or Fine-grained)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fossilized Bone Chunk (likely Dinosaur or Large Mammal)
Permineralized Fossil Bone
sedimentary
Chrysanthemum Stone
Chrysanthemum Stone (Calcite/Celestite/Strontianite in Limestone)
sedimentary
Chert (Flint) with Glauconite
Microcrystalline Quartz (SiO2)
sedimentary
Fossil bone, possibly a large mammal long-bone fragment
Fossilized cortical bone; taxon indeterminate from the photograph
fossil
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (Septarian or Banded Nodular Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized bone or tooth fragment
Indeterminate fossil bone; possibly mammalian or reptilian
fossil
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)
sedimentary
Sandstone
Clastic sedimentary rock (SiO2 primary)
sedimentary
Carnelian
Carnelian (Cryptocrystalline variety of Quartz, SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite (Cube variety)
Iron Sulfide (FeS2)
mineral
Blue apatite (likely rough/tumbled specimen)
Apatite group, commonly fluorapatite — Ca5(PO4)3F
mineral
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
sedimentary
Fossil oyster shell
Fossilized bivalve, likely an oyster (family Ostreidae); exact genus and age are indeterminable from the image
fossil
Fossiliferous Limestone / Petrifaction
Sedimentary rock with fossil inclusions / Calcium Carbonate (CaCO3)
fossil
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Ferruginous Sandstone (Gozzanous)
SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating
sedimentary
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Likely fossilized shell or carbonate concretion
Indeterminate biogenic calcium carbonate, commonly calcite (CaCO₃)
fossil
Fossilized Crinoid Stem Cross-Section
Crinoidea
fossil
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary
Galena (likely)
Galena, lead sulfide (PbS)
mineral
Polished fossil-bearing limestone
Fossiliferous micritic limestone, likely containing gastropod or ammonoid fragments
fossil
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Likely weathered iron-rich breccia or jasper
Silicified iron-oxide breccia; exact identification requires testing
sedimentary
Brown Quartz (Jasper or Chert)
Silicon Dioxide (SiO2)
sedimentary
Iron-oxide-stained jasper or weathered ironstone
Microcrystalline quartz (SiO₂) with hematite/goethite and probable clay minerals
mineral
Polished/tumbled brown-and-white mineral fragment
Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral
mineral
Weathered iron-rich stone, possibly jasper or chert
Microcrystalline quartz (SiO₂), likely stained by iron oxides/hydroxides
mineral
Jasper
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Fossilized bivalve shell fragment
Fossil Mollusca, likely a pectinid or related bivalve; exact identification requires the other shell half and locality
fossil
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Chert or jasper (iron-stained, brecciated variety)
Microcrystalline quartz (SiO₂), commonly termed jasper when strongly colored by iron oxides
sedimentary
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Weathered fossil shell fragment
Likely a fossilized bivalve or gastropod fragment; exact taxon cannot be determined from one view
fossil