Petrified Wood
Silicified Wood (SiO2)
fossil
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary
River cobble (Greywacke/Sandstone)
Sandstone / Greywacke
sedimentary
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Yellow Chert (Chert / Cryptocrystalline Quartz)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint variety)
Chert (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Basalt with Quartz Vein
Basalt with silicon dioxide (SiO2) inclusion
igneous
Granite
Intrusive Igneous Rock
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossil Shark Tooth
Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna
fossil
Fossilized Shark Tooth
Elasmobranchii fossil (likely Odontaspididae family)
sedimentary
Petrified Wood (Calamites Fossil)
Calamites sp. (Silicified/Permineralized Plant Fossil)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Coral (Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Amber
Succinicum (Organic polymer, largely C10H16O)
Organic Mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodule (Fossiliferous Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (Flint) Artifact
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodular Chert)
Silicon Dioxide (SiO2)
sedimentary
River Cobble (Weathered Granitoid)
Granodiorite / Quartz Diorite
igneous
Pyrite
Pyrite (Iron sulfide, FeS₂)
Mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement)
fossil
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineralized Apatite / Bio-apatite)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossil Shark Tooth
Otodus sp. (likely Otodus obliquus) fossil
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Fossilized Shark Tooth (Anterior/Lateral)
Otodus megalodon or Carcharodon carcharias (fossilized)
fossil
Septarian Nodule
Septarian Concretion (CaCO3 + Hydrated SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic