Calcite
Calcite (CaCO₃)
Mineral
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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Banded Sandstone (River Pebble)
Arenite (SiO2 primarily)
sedimentary
Mosasaur Tooth
Mosasaurus sp.
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Conglomerate
Conglomerate
sedimentary
Weathered banded iron formation (iron-rich quartzite)
Banded iron formation (BIF), chiefly hematite/magnetite and microcrystalline quartz (SiO₂)
sedimentary
Rounded sedimentary pebble, likely mudstone or shale
Argillite/mudstone; predominantly compacted clay minerals with quartz and iron oxides
sedimentary
Tumbled dark pebble, likely iron-rich jasper or chert
Jasper/chert, predominantly microcrystalline quartz (SiO₂) with iron-oxide impurities
sedimentary
Petrified Wood / Jasper Chert
Silicified Wood / Microcrystalline Quartz (SiO2)
sedimentary
Graywacke (Sandstone)
Lithic Sandstone (Graywacke)
sedimentary
Picture Jasper
SiO2 (Impure Microcrystalline Quartz)
sedimentary
Crinoid Stalk in Limestone
Crinoid fossil in Biomicrite (Limestone)
sedimentary
Stromatolite
Cyanobacteria fossilized formation (CaCO3)
sedimentary
Petrified Coral (Agatized Coral)
Anthozoa (Agatized Fossil)
sedimentary
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Orthoceras Fossil in Limestone
Orthoceras regulare
sedimentary
Weathered limestone or calcareous concretion
Calcite-rich carbonate rock; primarily calcium carbonate (CaCO₃), commonly calcite
sedimentary
Weathered iron-rich sandstone or lateritic rock
Ferruginous sandstone/laterite; chiefly quartz (SiO₂) with iron oxides such as hematite and goethite
sedimentary
Greywacke
Dirty Sandstone (Lithic wacke)
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Sandstone
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites sp. (Extinct genus of tabulate coral)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Graywacke (Sandstone)
Graywacke Sandstone
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Banded calcite (likely marble or calcite-rich limestone)
Calcite, CaCO₃; possibly calcitic marble
metamorphic
Fossilized Gastropod Shell
Gastropoda (Class) replacement / internal cast (steinkern)
fossil
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Banded Sandstone
Quartz Arenite (with iron oxide banding)
sedimentary
Shale (possibly)
Shale (fine-grained clastic sedimentary rock)
sedimentary
Bumblebee Jasper (technically Bumblebee Stone)
Calcite, Aragonite, and Realgar/Orpiment mixture (SiO2 + CaCO3 + As2S3/As2S2)
sedimentary (volcanic)
River Stone (Basalt or Siltstone with banding)
Polished Basaltic or Siliciclastic River Cobble
igneous or sedimentary
Beach Pebble (Basalt / Greywacke)
Basalt (or fine-grained Sedimentary Greywacke)
igneous
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Red jasper (likely iron-rich chert)
Microcrystalline quartz (SiO₂) colored by hematite/goethite
sedimentary
Weathered limestone
Calcitic limestone, mainly calcium carbonate (CaCO₃)
sedimentary