Chert Nodule / Ironstone Concretion
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Category
Sedimentary (Chemically Precipitated)
Browse sedimentary (chemically precipitated) specimens identified by the Rock Identifier community.
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Honey-colored calcite
Calcite (calcium carbonate, CaCO₃), likely rough or partly polished
mineral
Golden Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Red Jasper (River Pebble)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled yellow chalcedony (likely yellow jasper)
Microcrystalline quartz, SiO₂; chalcedony/jasper variety
mineral
Orange Calcite (Polished Sphere)
Calcium Carbonate (CaCO3)
mineral
Fossiliferous Limestone
Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)
fossil
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Blue calcite
Calcite (CaCO₃), likely blue calcite with white carbonate matrix
mineral
Sandstone (with Liesegang rings or Oxidation)
Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)
sedimentary
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Banded iron formation fragment
BIF; hematite–magnetite–chert/quartz assemblage
sedimentary
Chert (Flint / Agate Nodule)
Silicon Dioxide (SiO2)
sedimentary
Polished honey calcite heart
Calcite (calcium carbonate, CaCO₃)
mineral
Banded iron formation fragment
Banded iron formation (BIF), composed mainly of hematite/magnetite and chert (SiO₂)
sedimentary
Orange calcite (honey calcite)
Calcite, calcium carbonate (CaCO₃)
mineral
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Banded Iron Formation (BIF) / Ironstone Conglomerate
Ironstone (Hematite/Goethite rich sedimentary rock)
sedimentary
Amethyst Geode
Amethyst/Purple Quartz (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Honey Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Honey calcite (likely rough calcite crystal)
Calcite, calcium carbonate (CaCO₃)
mineral
Blue calcite (probable)
Calcite — CaCO₃
mineral
Milky quartz (quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Polished banded iron formation (BIF)
Banded iron formation; chiefly hematite/magnetite and microcrystalline quartz (chert), with iron silicates
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Weathered iron-rich rock, possibly limonite-bearing sandstone
Limonite/goethite-bearing sandstone or ferruginous conglomeratic rock
sedimentary
Fossiliferous Limestone
Calcite (CaCO3) matrix with biogenic fragments
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Moqui Marble
Ironstone Concretion (Goethite/Hematite)
sedimentary
Sandstone with Manganese Dendrites
Arenite (mostly SiO2) with Manganese Oxide inclusions (MnO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary