Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
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Fossilized tooth or bone fragment
Indeterminate fossil; possibly a small fossil tooth or mineralized bone, exact identification requires microscopy
fossil
Limestone with fossil crinoid stems
Calcium Carbonate (CaCO3) containing Crinoidea fossils
sedimentary
Amber
Succinite (Fossilized Tree Resin)
fossil
Tooth or bone fragment (likely animal tooth)
Indeterminate vertebrate tooth; possibly a small mammal or fish tooth
fossil
Freshwater Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic composite
gemstone
Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
mineraloid
Soil with Mineral Detritus and Quartz Fragments
Regolith / Silicate Mineral Aggregate
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fossilized tooth or jaw fragment (likely fish or reptile)
Indeterminate vertebrate bone/tooth; mineralized hydroxyapatite, commonly Ca₅(PO₄)₃(OH)
fossil
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Petrified Palm Wood
Palmoxylon
fossil
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
sedimentary
Tooth fossil, likely mammalian or reptilian fragment
Indeterminate fossilized tooth; enamel and dentine, taxon unresolved
fossil
Polished petrified wood
Silicified wood, primarily microcrystalline quartz (SiO₂) replacing cellular tissue
fossil
Orange Calcite (likely polished specimen)
Calcite
Mineral
Chert (Jasper / Petrified Wood)
Microcrystalline Quartz (SiO2)
sedimentary
Porous fossil fragment (possibly fossilized coral or shell)
Unidentified fossil carbonate; likely calcite/aragonite
fossil
Petrified wood
Silicified wood; commonly quartz (SiO₂) replacing original woody tissue
fossil
Mother of Pearl (Nacre)
Aragonite (layered with organic polymers), CaCO3
mineral
Pearl
Calcium Carbonate (Aragonite) - CaCO3
mineral
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Pearl
Calcium Carbonate (primarily Aragonite and Calcite), CaCO3
mineral
Petrified wood
Silicified wood, commonly quartz/chalcedony (SiO₂) replacing woody tissue
fossil
Fossilized wood (petrified wood)
Silicified fossil wood; commonly quartz (SiO₂) replacing wood tissues
fossil
Fossilized Stingray Mouth Plate
Myliobatidae gen. et sp. indet. (e.g., Myliobatis, Aetobatus)
fossil
Pink Aragonite
CaCO3
mineral
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Polished fossilized wood (likely petrified wood)
Silicified wood; commonly quartz (SiO₂) replacing wood tissue
fossil
Chert (and Fossilized Brachiopod shell)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized honeycomb coral
Fossil coral, commonly Favosites or related tabulate coral
fossil
Polished fossilized wood (petrified wood), likely agatized
Silicified wood; predominantly microcrystalline quartz/chalcedony (SiO₂), with iron-oxide coloration
fossil
Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil
sedimentary
Banded Iron Formation (BIF) / Chert
Banded Iron Formation (SiO2 with Fe2O3 / Fe3O4)
sedimentary
Chert Pebble with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Polished septarian nodule
Calcite–aragonite–barite septarian concretion, commonly in a claystone or limestone matrix
sedimentary
Fossilized mammalian tooth fragment
Likely a fossil molar or premolar; exact taxon cannot be determined from the image
fossil
Banded Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary