Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz or Chalcedony, SiO2)
mineral
Chert (Jasper/Common Opal transition)
Microcrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Coal (Bituminous)
Organic sedimentary rock primarily consisting of carbon (C)
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (often associated with Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint or Common Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Banded Variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Coral Fossil (Agatized Coral or Petoskey Stone)
Hexagonaria percarinata (if Petoskey) or generally Scleractinia (Agatized Coral)
Sedimentary/Fossil
Chert (Jasper/Black Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (potentially Jasper/Common Opal mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or Agate nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (variant Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Fossiliferous Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chrysocolla in Quartz
Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O in Quartz (SiO2)
gemstone
Smoky Quartz (with complementary stones in jewelry setting)
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Chert (Jasper influence)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint or Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Chert (variations include Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Gravel)
Microcrystalline silica (SiO2)
sedimentary
Coquina (Fossiliferous Limestone)
Coquina (Organic Clastic Limestone)
sedimentary
Chert (Red/Pink Jasper subtype)
Silicon Dioxide (SiO2)
sedimentary
Amethyst Geode
Amethyst (Silicon Dioxide, SiO2 with iron impurities)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Yellow/Tan)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint/Jasper)
Chert (SiO2)
sedimentary