Black Limestone
Bituminous Limestone (Calcium Carbonate - CaCO3)
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
Browse sedimentary (fossilized organic matter) specimens identified by the Rock Identifier community.
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Fossiliferous Limestone
Calcium Carbonate (CaCO3) with marine fossils
fossil
Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
sedimentary
Limestone (specifically Bituminous or Carbonaceous Limestone)
Calcium Carbonate (CaCO3) with Organic Impurities
sedimentary
White limestone or chalky carbonate rock
Calcite-rich limestone; possibly chalk (CaCO₃)
sedimentary
Pyrite in Shale
Iron Disulfide (FeS2)
mineral
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Fulgurite
Lechatelierite (Silica Glass)
mineral
Amber
Fossilized Tree Resin
gemstone
Amber
Fossilized Tree Resin
gemstone
Amber
Succinite (with a generalized formula of C10H16O)
mineral
Septarian Nodule
Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Clay)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Chalcedony (Common Opal variant)
Silicon dioxide (SiO2) with varying levels of hydration
mineral
Pyritic Shale
Carbonaceous Shale with Iron Pyrite (FeS2)
sedimentary
Travertine
Travertine (a terrestrial form of Limestone, CaCO3)
sedimentary
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Seashell Fossil
Gastropoda fossil
fossil
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Mineraloid
Amber
Fossilized Tree Resin
gemstone
Lignite (Brown Coal)
Humic Lignite (Carbonaceous sedimentary rock)
sedimentary
Amber
Fossilized Tree Resin
gemstone
Asphalt
Asphalt concrete
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Amber
Fossilized Tree Resin
gemstone
Flint with Fossil Inclusion
Cryptocrystalline quartz (SiO2) enclosing fossilized organic remains
sedimentary
Amber
Succinate (Fossilized Resin)
mineral
Manganese Dendrite on Siltstone
Manganese Oxide (pyrolusite or psilomelane) Dendrites
mineral/sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Amber
Fossilized Tree Resin
gemstone
Amber
Fossilized Tree Resin
gemstone
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Banded Chert
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Chalcedony mix)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
sedimentary
Glauconitic Sandstone
Glauconitic sandstone ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Amber (Copal)
Succinate (Fossilized Tree Resin)
mineraloid