Chert (often called Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Category
Organic (Sedimentary Context)
Browse organic (sedimentary context) specimens identified by the Rock Identifier community.
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Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper-rich)
Microcrystalline/Cryptocrystalline Quartz (SiO2)
sedimentary
Zebra Jasper
Opaque microcrystalline Quartz (SiO2) with impurities
sedimentary
Chert (Jasper/Limonitic Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Quartz (SiO2) with iron oxide inclusions
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Basal Bone)
Otodus sp. (Mineralized Hydroxyapatite)
sedimentary
Chert (specifically Flint or Common Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Dinosaur Skull Fossil (Velociraptor Replica)
Velociraptor mongoliensis fossil specimen in sedimentary matrix
sedimentary
Chert (specifically Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/Flint pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Sandstone
Arenite
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (CaCO3)
sedimentary
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Fossil Shark Tooth
Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite
fossil
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral, often found as detrital grains in sedimentary rocks
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Green Jasper)
Microcrystalline Quartz (SiO2) with iron silicate inclusions
sedimentary
Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Knightia Fossil in Limestone
Knightia eocaena in micritic limestone
sedimentary
Chert (specifically Blue Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz pseudomorph after wood)
fossil
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Glauconite sand
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Fossil Shark Tooth
Selachii (fossilized dentition)
fossil
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
mineral
Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)
Amber
Fossilized Tree Resin
gemstone
Amber
Succinite (specifically for Baltic amber); chemical formula approximately C10H16O
Mineraloid
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
sedimentary
Grey Limestone
Calcium Carbonate (CaCO3)
sedimentary