Chert (containing fossil leaf impression)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
Browse sedimentary (fossilized organic matter) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Concretion
Clastic Sedimentary Rock (primarily SiO2 with mineral cement)
sedimentary
Fossilized Ripple Marks or Stromatolite
Sedimentary ripple mark imprint / Biosedimentary structure
fossil
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Fossilized Coral (Favosites)
Favosites goldfussi / Tabulata
sedimentary
Fossilized Brachiopod Shell
Phylum Brachiopoda (likely Order Spiriferida or Strophomenida)
sedimentary
Fossilized Gastropod in Limestone
Gastropoda (Class) in Fossiliferous Limestone
sedimentary
Fossilized Honeycomb Coral
Favosites (extinct genus of tabulate corals)
sedimentary
Belemnite (Fossilized Rostrum)
Belemnitida (Order), composed of Calcite (CaCO3)
sedimentary
Fossilized Rugose Coral
Rugosa (Order Rugosa, typically fossilized in Limestone)
sedimentary
Fossilized Shark Tooth
Carcharocles sp. or similar Lamniformes
fossil
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Quartzite with Dendritic Manganese Oxide Inclusions
Metamorphic Quartzite (SiO2 with Mn-oxides)
metamorphic
Fossilized Shark Tooth (Fragment) in Matrix
Elasmobranchii (subclass)
fossil
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Order: Rugosa)
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Fossil Coral (Petoskey-style Rugose Coral)
Hexagonaria percarinata (Order: Rugosa)
sedimentary
Fossilized Gastropod Steinkern
Class Gastropoda internal mold
fossil
Fossilized Bored Limestone
Limestone with Ichnofossils (Gastrochaenolites or Entobia)
sedimentary
Fossilized Rugose Coral
Order Rugosa (Calcium Carbonate - CaCO3)
sedimentary
Fossilized Shark Tooth
Fossilized Elasmobranchii tooth (likely Odontaspis or Carcharias)
sedimentary
Dinosaur Bone (Fossilized)
Permineralized Bone (CaCO3 or SiO2 after Hydroxylapatite)
sedimentary
Fossilized Knightia Fish
Knightia eocaena (set in fossiliferous Micritic Limestone)
sedimentary
Fossilized Bone Fragment
Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)
sedimentary
Calamites (Fossilized Horsetail)
Calamites suckowii (Family: Calamitaceae)
sedimentary
Fossilized Gastropod Shell
Gastropoda (Class)
sedimentary
Fossilized Crinoid Stem
Class Crinoidea (Echinodermata)
sedimentary
Travertine
Calcareous Tufa (CaCO3)
sedimentary
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Fossilized bivalve shell
Bivalvia indeterminate; likely a fossil cockle or clam shell, aragonite/calcite replaced or preserved
fossil
Fossilized Blastoid (Sea Bud)
Pentremites sp. (Echinodermata, Blastoidea)
fossil
Ammonite Fossil
Ammonoidea (subclass)
fossil
Crinoid Stem Fossil
Class Crinoidea (Sea Lilies)
sedimentary
Spondylus Oyster Calcification / Fossilized Oyster
Spondylus (Thorny Oyster) / Calcium Carbonate (CaCO3)
sedimentary
Brachiopod Fossil
Phylum Brachiopoda (Class Rhynchonellata)
sedimentary
Fossilized Echinoid Fragment (Calycinal/Boss Fossil)
Echinodermata fossil fragment
fossil
Shungite
Carbonaceous rock (primarily amorphous carbon)
Mineraloid
Fossilized Limestone with Crinoid Stem
Carboniferous Limestone (containing Crinoidea ossicles)
fossil
Calamites Fossil (Horsetail Stem)
Calamites (Genus), part of the class Equisetopsida
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2 with impurities)
sedimentary
Amber
Fossilized tree resin (not a true mineral as it is organic and amorphous); Chemical formula is highly variable, but often approximated as C10H16O.
Mineral