Brachiopod Fossil in Matrix
Phylum Brachiopoda
fossil
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
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Red Tiger's Eye
SiO2 (Silicon Dioxide) - Pseudomorph of Quartz after Crocidolite
mineral
Mineral and Rock Collection (Assorted)
Mixed collection including Quartz (SiO2), Jasper (SiO2 with impurities), Rose Quartz, and Aventurine
mineral
Galena
Lead(II) sulfide (PbS)
mineral
Ammonite Fossil
Ammonoidea subclass (calcium carbonate / silica replacement)
fossil
Specular Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Fossil Snail
Gastropoda (fossilized)
fossil
Cowrie Shell Fossil
Cypraea sp.
fossil
Pyrite and Calcite (or Barite) Specimen
Iron Sulfide (FeS2) with Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Fossilized Shark Tooth (Otodus)
Otodus sp. (calcium phosphate/hydroxylellite)
sedimentary
Calamites
Calamites (Pith cast fossil)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Tooth or shell fragment (likely fossilized marine material)
Indeterminate; possibly a fossil fish tooth or mollusk shell fragment composed mainly of calcium carbonate (CaCO₃)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Poppy Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Fossilized Coral (Honeycomb Coral)
Favosites (extinct genus of tabulate corals), CaCO3 (Calcium Carbonate)
sedimentary
Rhodochrosite
Rhodochrosite, Manganese Carbonate (MnCO3)
mineral
Fossilized Tooth Fragment
Vertebrate Fossil (Mammalia indet.)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Murex Fossil
Muricidae (Calcium Carbonate fossilization)
fossil
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Fossil Shell
Phylum Mollusca (Bivalvia or Brachiopoda)
fossil
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Polished amber-colored stone, possibly chert or jasper
Uncertain from image; likely microcrystalline quartz (SiO₂) if chert/jasper
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Triceratops Fossil
Triceratops horridus
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Banded Jasper (Mookaite / Chert)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Fossilized Bivalve Shell
Bivalvia (fossil specimen)
sedimentary
Fossil Shark Tooth
Lamniformes (order) - likely Cretalamna or Carcharias species
fossil
Banded Jasper
Silicate Mineral (Microcrystalline Quartz / SiO2)
sedimentary
Gastropod Steinkern (Fossilized Snail Cast)
Phylum Mollusca, Class Gastropoda (Commonly CaCO3 or SiO2 after replacement)
Sedimentary
Tiger's Eye
Quartz pseudomorph after crocidolite (SiO2)
gemstone
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)
Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)
sedimentary