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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Pearl
Biogenic CaCO3 (Aragonite and Calcite)
mineral
Pearl
Calcium Carbonate (Aragonite/Calcite mixed with Conchiolin), CaCO3
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Chert
Channery Chert (Microcrystalline Quartz)
sedimentary
Amber
Fossilized Tree Resin (Succinate)
mineral
Fossilized Shark Teeth
Carcharhiniformes or Lamniformes species (common mineral: Fluorapatite/Ca5(PO4)3F)
sedimentary (fossilized organic matter)
Weathered fossilized wood (likely petrified wood)
Silicified wood; commonly quartz/chalcedony replacing wood tissue (SiO₂)
fossil
Horn Coral Fossil
Rugose coral (Order Rugosa)
fossil
Amber
Succinite (C10H16O)
mineral
Polished fossil coral
Fossilized colonial coral, commonly tabulate or rugose coral; calcite (CaCO₃) replacement
fossil
Amber
Succinite (C10H16O)
mineraloid
Fossilized bone fragment (probable large mammal limb bone)
Mineral-replaced or permineralized bone; exact taxon cannot be determined from the image
fossil
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Petrified wood
Silicified wood (commonly quartz/chalcedony replacing wood)
fossil
Limestone with Fossil Inclusion
Calcium Carbonate (CaCO3) - Bioclastic Limestone
sedimentary
Amber
Succinite (a fossilized organic resin)
mineral
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Amber
Amber (C10H16O)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Possible fossilized bone or tooth fragment
Indeterminate fossilized vertebrate material; mineralized hydroxyapatite replaced or coated by silica/carbonate
fossil
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite or Magnetite inclusions)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Shell fossil or shell fragment
Likely a bivalve shell, composed mainly of calcium carbonate (aragonite/calcite); exact species cannot be determined from one photo
fossil
Amber
Resinite / Fossilized Tree Resin
mineral
Amber
Succinite (Resinous fossilized tree sap)
Mineraloid
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement)
fossil
Fossil shark tooth
Likely fossilized shark tooth, possibly Otodus megalodon
fossil
Fossilized wood (petrified wood)
Silicified permineralized wood, commonly quartz (SiO₂) replacing or infilling woody tissue
fossil
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Fossilized Bone (Petrified Bone)
Permineralized Vertebrate Remains
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Echinoid
Echinoidea (likely of the order Echinoidea)
fossil
Red coral (likely precious coral)
Corallium sp.; calcium-carbonate skeleton, primarily calcite
gemstone
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Palmwood
Palmoxylon (fossilized monocot xylem)
sedimentary
Polished moss agate (probable)
Chalcedony, microcrystalline quartz (SiO₂), with iron/manganese inclusions
gemstone
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and/or Chalcedony)
Silicon dioxide (SiO2)
sedimentary
Fossilized wood fragment
Petrified wood; commonly silicified fossil wood (SiO₂ replacing organic tissue)
fossil
Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)