Chert (containing Flint and Calcareous inclusions)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) impurities
sedimentary
Category
Organic (Sedimentary Context)
Browse organic (sedimentary context) specimens identified by the Rock Identifier community.
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Chert (often called Flint or River Stone)
Microcrystalline alpha-quartz (SiO2)
sedimentary
Chert (Smooth River Siltstone/Basalt variant)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (White Chert / Flint)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Palm Wood Fossil
Palmoxylon
fossil
Fossilized Insect in Nodular Matrix
Invertebrata / Insecta fossil in sedimentary concretion
fossil
Fossilized Shark Tooth
Eocene Lamniformes (Mackerel Shark clade)
fossil
Banded Chert (Ironstone type)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Chert (Jasper/River Stone)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Fossilized Vertebra
Chordata fossil (Vertebra)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Stromatolite
Biogenic Sedimentary Rock (composed predominantly of CaCO3)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement)
fossil
Pyrite
Pyrite (Iron sulfide, FeS₂)
Mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz / Chalcedony)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper (Mookaite style)
Silicon Dioxide (SiO2) with Goethite/Hematite inclusions
sedimentary
Chert (Cherty Flint/Jasper variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Mosasaur Tooth
Mosasaurus sp.
fossil
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
River Stone (Limestone)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (Light Variety)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Crushed Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Bituminous Coal
Organic Sedimentary Rock (composed mostly of carbon with sulfur and hydrogen)
sedimentary
Rounded brown sandstone or weathered river cobble
Likely quartz-rich sandstone; exact identification requires a fresh surface and tests
sedimentary
Shale (or Slate / Coal / Jet)
Laminated fine-grained sedimentary rock (predominantly clay minerals)
sedimentary
Sandstone with Iron Oxide Concretion
Arenite with Hematite/Goethite Concretion
sedimentary
Green Moss Agate / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions
sedimentary
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
sedimentary
Gastropod Fossil (Snail Steinkern)
Class Gastropoda (internal mold)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossil Shark Tooth
Odontaspididae (likely Carcharias sp.)
fossil
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Mineraloid
Shark Tooth Fossil
Otodus sp. (possibly Cretalamna)
fossil
Limestone
Calcium carbonate (CaCO3)
sedimentary
Petrified Wood (Silicified Fossil)
Silicified Wood (SiO2)
sedimentary