Petrified Wood
Silicified Wood (SiO2)
fossil
Category
Organic (Paper And Cellulose)
Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.
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Fossiliferous Jasper / Miriam Stone / Elephant Skin Jasper
Biogenic Chalcedony / Silicified Fossiliferous Limestone
fossil
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (Permineralized organic tissue)
fossil
Jasper (Green Jasper / Chert)
Silicon Dioxide (SiO2 with inclusions)
mineral
Petrified Wood
Silicified wood / Xylopal
fossil
Petrified Wood
Silicified wood (Quartz replacement of organic wood structure)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Chert (Weathered)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony/SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Veined Limestone
Sedimentary Calcite-Veined Rock (CaCO3)
sedimentary
Fossil Shark Tooth
Carcharodon carcharias (modern/recent) or similar Lamniform fossil
fossil
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with impurities of Hematite or Goethite
sedimentary
Seashell Fossil
Invertebrate fossil (phylum Mollusca)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Limestone (Weathered)
Sedimentary carbonate rock, primarily calcium carbonate (CaCO3)
sedimentary
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (often called Flint when found in chalk/limestone)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chert Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Grey and White Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz / Chalcedonized wood, SiO2)
sedimentary