Limestone with Iron Oxide Staining
Sedimentary Rock (Calcite, CaCO3)
sedimentary
Category
Organic Structure (Not A Rock)
Browse organic structure (not a rock) specimens identified by the Rock Identifier community.
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Heart-shaped Limestone
Calcium Carbonate (CaCO3)
sedimentary
Microcrystalline Quartz (Chert/Agate)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Limestone and Sandstone Assortment
Sedimentary Rock Assemblage
sedimentary
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Sandstone (Quartz Arenite / Arkose with Hematite cement)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Sandstone
Sandstone (Siliciclastic Sedimentary Rock)
sedimentary
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
sedimentary
Sandstone
Arenite (SiO2 composed primarily of quartz)
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Fossilized Brain Coral
Diploria labyrinthiformis (Fossilized)
sedimentary
Bituminous Coal
Organic-rich sedimentary rock (Complex hydrocarbons)
sedimentary
Limestone Concretion
Calcium Carbonate Concretion (CaCO3)
sedimentary
Shale (or Slate / Coal / Jet)
Laminated fine-grained sedimentary rock (predominantly clay minerals)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert Nodule / Ironstone Concretion
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (CaCO3)
sedimentary
Anthracite Coal
Anthracite (a variety of coal, predominantly carbon)
Sedimentary Rock (Metamorphosed)
Limestone Pebble
Sedimentary Rock (Calcite, CaCO3)
sedimentary
Baroque cultured pearl necklace
Pearl: nacre composed mainly of aragonite (CaCO₃) and conchiolin
gemstone
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate)
sedimentary
Lapis Lazuli
Na8(Al6Si6O24)S2 (composed primarily of Lazurite, Calcite, and Pyrite)
metamorphic
Seashell Fossil
Gastropoda fossil
fossil
Shale
Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)
sedimentary
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Fossilized Brachiopod
Brachiopoda (Phylum)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate)
sedimentary
Fossilized Bone Fragment
Vertebrate Fossil
fossil
Glauconitic Sandstone
Glauconitic Sandstone with high Glauconite concentration ((K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Fossilized Coral
Rugosa / Scleractinia (Agatized or Calcitized Coral)
fossil
Banded Chert
Chert (Silicon Dioxide, SiO2)
sedimentary
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Ironstone Nodules in Chalk/Limestone
Limonite/Goethite concretions (FeO(OH)·nH2O) in Calcium Carbonate matrix (CaCO3)
sedimentary
Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Chert with Calcite Veins
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions
sedimentary