Petrified Wood
Silicified Wood (SiO2)
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
Browse sedimentary (fossilized organic matter) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (primarily Silicon Dioxide, SiO2)
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with marine fossils
fossil
Moss Agate
Silicon dioxide (SiO2) with mineral inclusions
Mineral
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxide
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Amber
Succinite (a specific high-quality amber from the Baltic)
Organic Mineraloid
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Shark Tooth Fossil
Carcharodonta (order Lamniformes), likely Carcharias spp.
fossil
Fossil Shell (Bivalve)
Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3
sedimentary
Fossiliferous Limestone
Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)
fossil
Hardpan Nodule / Ferruginous Sandstone
Ferruginous Sandstone (Fe-cemented sediment)
sedimentary
Fossil Snail
Gastropoda (fossilized)
fossil
Fossilized Horse Tooth
Equus sp. (fossilized molar)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Septarian Nodule (Dragon Stone)
Septarian Nodule (Calcium Carbonate/Aragonite/Calcite Concretion)
sedimentary
Vivianite
Vivianite, Fe2+3(PO4)2·8H2O
mineral
Pyrite in Slate
Iron Sulfide (FeS2) in Slate host matrix
metamorphic
Chrysanthemum Stone
Celestine (SrSO4) or Calcite (CaCO3) in Limestone/Porphyry matrix
metamorphic
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossil Coral (Rugosa or Solitary Coral)
Rugosa (Order), often referred to as 'Horn Coral' (Lithostrotionella or Grewingkia)
sedimentary
Fossilized stromatolite or laminated microbial mat
Layered carbonate/chert fossil; exact taxon indeterminate from the image
fossil
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Honeycomb coral fossil
Fossilized colonial coral, likely tabulate coral (order Tabulata)
fossil
Fossiliferous shale or slate with plant impressions
Carbonaceous mudstone/shale; possible fossil plant material (often fern-like impressions)
fossil
Polished amber cabochon
Amber (fossilized plant resin; chiefly carbon, hydrogen, and oxygen, with variable organic compounds)
gemstone
Amber-bearing rough specimen
Fossilized plant resin (amber; organic mineraloid), commonly succinite
gemstone
Shark Tooth Fossil
Otodus obliquus (or similar prehistoric lamniform shark tooth)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Chert Nodule with Cortex)
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (Chalcedony with green mineral inclusions), SiO2
gemstone
Fluorite
Calcium Fluoride (CaF2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Fe/Mn/Mg)
mineral
Amber
Succinite (fossilized tree resin)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
fossil
Fossil Snail
Gastropoda (fossilized)
fossil
Green Moss Agate
Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite
mineral
Moss Agate and Hematite
Silica (SiO2) with fibrous inclusions of Manganese or Iron; Hematite (Fe2O3)
mineral
Polished petrified wood
Silicified fossil wood, chiefly microcrystalline quartz (SiO₂)
fossil
Petrified Wood
Silicified wood (primarily quartz replacing organic cellulose)
fossil