Lignite (Brown Coal)
Humic Lignite (Carbonaceous sedimentary rock)
sedimentary
Category
Sedimentary (Fossil)
Browse sedimentary (fossil) specimens identified by the Rock Identifier community.
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Ferruginous Sandstone (with Laterite)
Ferruginous Arenite (FeO(OH)·nH2O)
sedimentary
Marble
Metamorphic carbonate rock (Calcite/Dolomite)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Limestone
Sedimentary rock composed primarily of calcium carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Banded)
Silicon Dioxide (SiO2)
sedimentary
Chert (potentially Fossiliferous or Jasperoid)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Coquina
Coquina (a type of limestone)
Sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Liesegang Ring Siltstone
Siltstone with iron oxide Liesegang bands
sedimentary
Fossiliferous Limestone
Carbonate Rock (CaCO3 with organic inclusions)
sedimentary
Iron-stained sandstone or weathered ironstone concretion
Quartz-rich sandstone, locally cemented by iron oxides (hematite/goethite); exact identification requires testing
sedimentary
Petoskey Stone
Favosites alpenensis
fossil
Unidentified weathered rock fragments
Likely mixed silicate rocks; specific identification requires testing
mineral
Fossil Shark Tooth
Carcharhinidae or Lamniformes sp. (possibly Carcharodon or Otodus genus)
fossil
Limestone (with possible Manganese oxide inclusions)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified wood (Quartz, SiO2)
metamorphic
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (and Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert Conglomerate (or Breccia)
Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)
sedimentary
Limestone
Calcium carbonate ( преимущественно CaCO3)
sedimentary
Flint Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Ferruginous Sandstone (ironstone)
Sandstone with iron oxide cement (limonite/hematite)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Dendritic Agate
Silicon Dioxide with Manganese or Iron Oxide inclusions (SiO2)
sedimentary
Sandstone Cobble with Liesegang Rings
Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)
sedimentary
Chert (Nodular Chert)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Fossiliferous Limestone
Calcium carbonate matrix with macrofossils (CaCO3)
fossil
Amber
Succiniferous fossil resin (C10H16O)
gemstone
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Amber
Succiniferous fossil resin (C10H16O)
mineral