Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
Browse sedimentary (fossilized organic matter) specimens identified by the Rock Identifier community.
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Pyrite (Fool's Gold) Cube
Iron Sulfide (FeS2)
mineral
Chert (Jasper)
Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (composed primarily of Fluorapatite)
mineral
Fossiliferous Limestone
Fossiliferous Limestone (containing bioclasts)
sedimentary
Chert (Yellow Jasper/Honey Chert)
Silicon Dioxide (SiO2)
sedimentary
Fossil Coral (Tabulate Coral Fragment)
Anthopleura / Tabulata (CaCO3 - Calcium Carbonate)
fossil
Anthracite Coal
Anthracite (a variety of coal, predominantly carbon)
Sedimentary Rock (Metamorphosed)
Fossilized Bone Fragment
Petrified Osseous Material
fossil
Fossilized Shark Tooth
Elasmobranchii gen. indet.
fossil
Fossilized cylindrical shell or bone fragment
Indeterminate biogenic carbonate or phosphatic fossil; possible fragment of a tubular shell (e.g., scaphopod) or hollow bone
fossil
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
fossil
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineral: Fluorapatite)
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized rugose coral)
fossil
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Coral Fossil (Fossilized Coral)
Hexagonaria or similar rugose/tabulate coral fossil (Calcium Carbonate, CaCO3)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Poppy Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Apatite
Apatite group (Ca5(PO4)3(F,Cl,OH))
mineral
Jasper
Microcrystalline Quartz (SiO2)
Sedimentary/Mineral
Flint (Chert Node)
Silicon Dioxide (SiO2)
sedimentary
Chert (and Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite Geode
Iron Disulfide (FeS2)
mineral
Orange calcite
Calcite (CaCO₃), likely honey/orange calcite
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized crinoid columnal (likely crinoid stem segment)
Crinoidea; commonly preserved as calcite, CaCO₃
fossil
Chert (Sedimentary Rock)
Silicon Dioxide (SiO2)
sedimentary
Shale
Mudrock / Fissile Shale
sedimentary
Sandstone Concretion with Fossil Wood
Ferruginous Sandstone Concretion (SiO2 with Fe2O3 cement)
sedimentary
Tumbled brown quartz/chert pebble
Microcrystalline quartz (SiO₂), possibly chert or jasper
mineral
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Limestone with Gastropod Fossil
Sedimentary Calcium Carbonate (CaCO3) with Gastropoda inclusion
fossil
Chert with Quartz Veins
Microcrystalline silica (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Fossiliferous Limestone
Carbonate Rock (CaCO3 with organic inclusions)
sedimentary
Fossiliferous Limestone (Shell Fragment)
Biogenic Limestone (Calcium Carbonate / CaCO3)
sedimentary