Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
Learn about Mineral Like Biological Tissue in the encyclopedia
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Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous
Likely petrified wood or silicified fossil fragment
Silicified wood; predominantly microcrystalline quartz (SiO₂)
fossil
Amber
Succinite (C10H16O)
mineraloid
Amber
Succinite (a fossilized organic resin)
mineral
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Amber
Resinite / Fossilized Tree Resin
mineral
Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)
Amber
Succinite (Resinous fossilized tree sap)
Mineraloid
Chert (and/or Chalcedony)
Silicon dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Freshwater Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic composite
gemstone
Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
mineraloid
Fossilized Echinoid
Echinoidea (likely of the order Echinoidea)
fossil
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement)
fossil
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Fossil Shark Tooth
Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth
sedimentary
Orange Calcite (likely polished specimen)
Calcite
Mineral
Banded Iron Formation (BIF) / Chert
Banded Iron Formation (SiO2 with Fe2O3 / Fe3O4)
sedimentary
Fossilized Shark Tooth (Otodus)
Otodus sp. (calcium phosphate/hydroxylellite)
sedimentary
Mother of Pearl (Nacre)
Aragonite (layered with organic polymers), CaCO3
mineral
Pearl
Calcium Carbonate (Aragonite) - CaCO3
mineral
Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
sedimentary
Petrified Palmwood
Palmoxylon (fossilized monocot xylem)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Amber (C10H16O)
mineral
Chert (Jasper / Petrified Wood)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet.
fossil
Petrified Palm Wood
Palmoxylon
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized wood fragment
Petrified wood; commonly silicified fossil wood (SiO₂ replacing organic tissue)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Calcium carbonate (CaCO3) in the form of aragonite or calcite
mineral
Limestone with fossil crinoid stems
Calcium Carbonate (CaCO3) containing Crinoidea fossils
sedimentary
Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil
sedimentary
Amber (Copal)
Succinate (Fossilized Tree Resin)
mineraloid
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class)
sedimentary