Sandstone
Arenite
sedimentary
Category
Organic Structure (Not A Rock)
Browse organic structure (not a rock) specimens identified by the Rock Identifier community.
Learn about Organic Structure (Not A Rock) in the encyclopedia
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Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Limestone
Sedimentary Rock (Primarily Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone with Brachiopod/Crinoid fragments
sedimentary
Chert (often called Flint)
Chert (Microcrystalline or cryptocrystalline Silica, SiO2)
sedimentary
Chert Concretion with Iron Oxide Staining
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Coral (Honeycomb Coral)
Favosites (extinct genus of Tabulate coral)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nodules)
Chert (Silicon Dioxide, SiO2)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Fossiliferous Limestone with Coral Imprint
Fossiliferous Limestone (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Lapis Lazuli
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Bauxite (Laterite Clay)
Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
sedimentary
Chert / Flint Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shell
Brachiopod or Mollusk fossil
fossil
Note regarding baguette production (not a rock)
Digital text image - Somali language
not a rock
Lapis Lazuli
Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Fossiliferous Sedimentary Rock
Sedimentary Rock with Invertebrate Fossil Imprint
fossil
Banded Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Fossilized Coral (Petrified Coral)
Lithostrotionella (example genus) / Scleractinia
fossil
Ironstone Concretion (Moqui Marble / Boji Stone)
Sedimentary Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Amber (Copal)
Fossilized Tree Resin
mineraloid
Sandstone
Arenite (SiO2 composed primarily of quartz)
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Chert Nodule (with Geode cavity)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Fossiliferous Limestone with Fossil Fragment
Fossiliferous Limestone (CaCO3 with organic remains)
fossil
Chert Nodules
Chert (SiO2)
sedimentary
Sandstone
Sandstone (Siliciclastic Sedimentary Rock)
sedimentary
Limestone with Calcite Veining
Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Fossilized tooth, likely mammoth or mastodon molar fragment
Proboscidean molar enamel and dentin; Mammuthus or Mammut sp. (tentative)
fossil
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary
Glauconitic Sandstone
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Lignite (Brown Coal)
Humic Lignite (Carbonaceous sedimentary rock)
sedimentary
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary