Chert (Jasper/Carnelian variety)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
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Likely petrified wood
Silicified wood, chiefly microcrystalline quartz (SiO₂)
fossil
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
mineral
Chert / Flint
Microcrystalline Silica (SiO2)
sedimentary
Pyrite (on host rock/ore)
Iron Sulfide (FeS2)
mineral
Amber
Succinate (Organic Fossilized Resin)
mineraloid
Pyrite
Iron Disulfide (FeS2)
mineral
Fossilized Shark Teeth in Matrix
Cretaceous Chondrichthyes (Shark) remains in Sedimentary Matrix
fossil
Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Chert (also known as Flint or Common Chalcedony)
Cryptocrystalline Silica (SiO2)
sedimentary
Limestone
CaCO3 (Mainly Calcite or Aragonite)
sedimentary
Fossilized Gastropod Shell
Class Gastropoda (Fossil)
sedimentary
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Petrified Bone (Fossil Bone)
Per mineralization fossil bone (varies by organism, predominantly replacement by SiO2 - Quartz/Chalcedony)
fossil
Chert with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Green Turban Shell (Polished)
Turbo marmoratus (Aragonite/Calcite)
mineral
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Fossilized Rugose Coral (Petoskey Stone type)
Hexagonaria percarinata (Order: Rugosa)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossiliferous Brachiopod in Shale
Brachiopoda (Phylum) preserved in Carbonaceous Shale
sedimentary
Shark Tooth Fossil
Otodus obliquus (or similar prehistoric lamniform shark tooth)
fossil
Flint in Limestone (Chert Nodule)
Sedimentary rock containing microcrystalline quartz (SiO2) within a carbonate matrix
sedimentary
Chert (Chert breccia)
SiO2 (Silicon Dioxide)
sedimentary
Chert (Greenish-Grey variety)
Microcrystalline quartz (SiO2)
sedimentary
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Quartz with Pyrite and Lichen
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Black Pearl (Tahitian or Irradiated Type)
Organic gemstone (Calcium Carbonate with Conchiolin Binding)
mineraloid
Tahitian Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Gastropod shell fragment
Calcareous mollusk shell; primarily aragonite or calcite (CaCO₃)
fossil
Fossiliferous Limestone
Fossiliferous Calclutite / Bio-calcarenite (CaCO3)
sedimentary
Hag Stone (Sandstone with Boreholes)
Bored Sandstone (Sedimentary rock with lithophaga-style borings)
sedimentary
Fossiliferous Limestone with Brachiopod
Limestone (Calcium Carbonate, CaCO3) with Phylum Brachiopoda fossil
sedimentary
Mosasaur Tooth Fossil
Mosasauridae (likely Prognathodon or Mosasaurus)
fossil
Petrified Wood
Silicified Wood / Xylopal
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Amber
Fossilized Resin (C10H16O)
mineral
Fossiliferous Limestone
CaCO3 (with biological inclusions)
sedimentary