Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
fossil
Category
Sedimentary (Biogenic Sediment Or Biological Remain)
Browse sedimentary (biogenic sediment or biological remain) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Biogenic Sediment Or Biological Remain) in the encyclopedia
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Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
Fossilized Syringopora (Piping Organ Coral)
Syringopora (Extinct Genus of Tabulate Coral)
sedimentary
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Amber
Succinite (C10H16O)
mineraloid
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Ironstone Concretion
Ferruginous Siltstone/Ironstone (Fe2O3)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Leopard Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Iron Concretion
Ferruginous concretion (Fe2O3·nH2O / FeO(OH))
sedimentary
Fossilized Brachiopod Shell
Order Spiriferida (likely)
fossil
Desert Varnish (on Sandstone)
Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Concretion
Ferruginous Sandstone Concretion
sedimentary
Kambaba Jasper (Crocodile Jasper)
Rhyolite containing Fossilized Cyanobacteria (Stromatolite)
sedimentary
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Fossilized Shark Tooth
Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineral
Megalodon Shark Tooth
Otodus megalodon
fossil
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Coarse Sand or Fine Gravel
Clastic Sediment (unconsolidated)
sedimentary
Chert (Nodular)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Fossiliferous Brachiopod in Shale
Brachiopoda (Phylum) preserved in Carbonaceous Shale
sedimentary
Grooved Maun Ball (Maul/Hammerstone-like Concretion)
Calcareous/Ferruginous Concretion in Sandstone Matrix
sedimentary
Chert / Flint (with Iron Staining)
Silicon Dioxide (SiO2)
sedimentary
Quartz-veined Sandstone Pebble
Quartzite-veined Arenite
sedimentary
Concretion (Sandstone)
Sandstone Concretion
sedimentary
Calcite (Yellow/Orange variety - sometimes called Honey Calcite)
Calcite
Mineral
Shale
Shale (clay-rich mudstone)
sedimentary
Sandstone (with banding/weathering)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Echinoid Fossil / Fossilized Sea Urchin
Echinoidea
fossil
Pebbles
Polymictic rock fragments
sedimentary
River Pebble
Lithified clastic sediment
sedimentary
Common Pebble / Sedimentary Rock Fragment
Lithified clastic sediment
sedimentary
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Fossilized Shark Tooth (Fragment) in Matrix
Elasmobranchii (subclass)
fossil
Flagstone paving (likely sandstone or limestone)
Clastic sandstone or carbonate limestone; exact identification requires testing
sedimentary
River Pebble (Gravel)
Rounded clastic sediment
sedimentary
Quartz-Veined Mudstone
Argillaceous Mudstone with Quartz Veining
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)
sedimentary