Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
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Fossiliferous Limestone with Brachiopod
Phylum Brachiopoda in calcitic matrix
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class)
sedimentary
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin
gemstone
Chert (Black Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (BIF), SiO2 / Fe2O3
sedimentary
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Crinoid Stem
Class Crinoidea (Echinodermata)
sedimentary
Likely aragonite crystal cluster
Aragonite, CaCO₃
mineral
Pearl
Aragonite and Conchiolin (CaCO3 + organic protein)
mineraloid
Chert / Fossilized Burrow Cast
Microcrystalline Quartz (SiO2) with Trace Carbonates
sedimentary
Aragonite (Yellow/Honey Tumble)
Calcium Carbonate (CaCO3)
mineral
Fossil bone fragment, likely vertebrate limb or rib bone
Fossilized bone (apatite-rich hydroxyapatite, Ca₅(PO₄)₃OH); exact taxon indeterminate
fossil
Chert
Silicon dioxide (SiO2)
Sedimentary
Fossilized bone fragment
Petrified bone, mineral-replaced vertebrate bone; exact taxon indeterminate
fossil
Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Coral Fossil
Anthozoa (order Scleractinia)
fossil
Crinoidal Limestone
Fossiliferous Limestone containing Crinoid stem fragments (Echinodermata)
fossil
Shungite
Fullerene-bearing carbonaceous rock
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Chert (Iron-stained)
Microcrystalline silica (SiO2) with trace Iron oxide (Fe2O3)
sedimentary
Marine invertebrate fossils (Brachiopods and Gastropods)
Phylum Brachiopoda and Class Gastropoda
fossil
Chert (Common Opal/Jasper transition)
Silicon Dioxide (SiO2)
sedimentary
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Chert (Flint Nodules)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Kidney Stone
Calcium oxalate, uric acid, struvite, or cystine
mineral
Amber
Succinite (specific to Baltic amber), fossilized tree resin
Organic Mineraloid
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Fossilized leaf or plant impression in shale
Carbonized/impressed plant fossil, likely in fine-grained shale or mudstone; exact taxon indeterminate from the image
fossil
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Limestone (containing Fossil Mold)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified wood
Silicified wood, commonly quartz (SiO₂) replacing woody tissue
fossil
Smurf Rock (Fictional Interpretation)
Cyanus Anthropomorphicus (Geologic Simulation)
Artificial/Fantasy Object
Amber
Succinite (with empirical formula approximately C10H16O)
Organic Mineraloid
Amber (Copal)
Succinate (Fossilized Tree Resin)
mineraloid
Fossil shark teeth
Probably fossilized shark teeth, possibly *Otodus* or *Carcharhinus* species
fossil
Chert (Cherty Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (with Quartz/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary