Petrified Wood
Silicified Wood (SiO2)
sedimentary
Category
Organic Gemstone (Sedimentary Classification)
Browse organic gemstone (sedimentary classification) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Sedimentary Classification) in the encyclopedia
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Chert (Grey/Black variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Flint Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint in this context)
Silicon Dioxide (SiO2)
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Asphalt / Bituminous Aggregate
Bituminous mixture (Hydrocarbon-based sediment)
sedimentary
Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Travertine (Tufa)
Chemical Limestone (CaCO3)
sedimentary
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Tan/Brown variety)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Cherty Limestone or Flint)
Microcrystalline Silica (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert with Quartz/Calcite Vein
Microcrystalline Silica (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Fossil Plant Impression (Calamites)
Calamites sp. (Tracheophyta: Equisetopsida)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sulfidic Mudstone with Pyrite/Goethite
Sulfidic Siltstone/Mudstone (FeS2)
sedimentary
Chert (variations include Flint/Jasper)
Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (CaCO3)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Chert (containing Fossil Inclusions)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Black Chert/Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Crinoid Stem Segment
Crinoid (Phylum Echinodermata, Class Crinoidea)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
sedimentary
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (specifically Pink/Tan Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Gray/Blue Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Chert (Brown Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint or Jasperoid)
Silicon Dioxide (SiO2)
sedimentary