Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Organic Materia (Not A Rock Or Mineral) in the encyclopedia
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Moqui Marbles
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
metamorphic
Fossilized Oyster Shell (Limestone/Coquina)
Crassostrea (Fossilized Bivalve), Calcium Carbonate (CaCO3)
sedimentary
Quartz Vein in Amphibolite / Gneiss
Quartz (SiO2) in Mafic Metamorphic Host Rock
metamorphic
Granite
Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Quartz (Clear/Smoky Geode fragment)
Silicon Dioxide (SiO2)
mineral
Fossilized Rugose Coral (Horn Coral)
Order Rugosa
sedimentary
Gossan (with Limonite/Hematite coating)
Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Brachiopod Fossil (Spiriferid)
Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)
sedimentary (fossilized organic remain)
Quartz-Veined Slate or Greenstone
Metamorphic rock with quartz vein (SiO2)
metamorphic
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Mammoth or Mastodon Tooth Fossil
Proboscidea tooth (Mammuthus or Mammut)
fossil
Chert (Yellow Jasper/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
River Stone (likely Basalt or Greywacke)
Basalt with mineral veining
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sandstone (with Rock Art)
Sandstone (Clastic Sedimentary Rock)
sedimentary
Amber (Cherry or Red variety)
Succinite (with various trace amounts of organic compounds)
Organic Gemstone (not a rock)
Fossilized Horse Tooth
Equus sp. (fossilized molar)
fossil
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone with Manganese Dendrites
Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Sandstone
Quartz Sandstone (predominantly)
Sedimentary
Chert (specifically Blue Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Limestone (Travertine/Tufa variant)
Calcium Carbonate (CaCO3)
sedimentary
Chert (Arrowhead Preform or Flake)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Black Chert
Carbonaceous Chert (Silicon dioxide, SiO2)
sedimentary
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Pearl
Calcium Carbonate (Aragonite/Calcite mixed with Conchiolin), CaCO3
mineral
Chert (often called Flint or River Rock)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ironstone Concretion (Limonite/Hematite Nodules)
Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)
sedimentary