Fossilized Brachiopod Shell in Matrix
Phylum Brachiopoda (typically Calcium Carbonate or Chitinophosphatic)
sedimentary
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
Learn about Mineral Like Biological Tissue in the encyclopedia
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Northern Shoveler Duck (Note: This is a biological specimen, not a rock)
Spatula clypeata
not a rock (biological/ornithological)
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
sedimentary (biogenic)
Amber
Succinite (approximate formula C10H16O)
mineral
Amber / Copal
Fossilized Tree Resin (Succinate)
Mineraloid
Seashell (Cockle Shell)
Cardiidae (Bivalvia), primary composition: Calcium Carbonate (CaCO3) in the form of aragonite or calcite
fossil
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Fenestella Bryozoan Fossil
Fenestella (class Stenolaemata)
fossil
Fossil Shark Tooth
Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet.
fossil
Likely fossilized bone or tooth fragment
Indeterminate fossil bone; mineral replacement commonly calcite, silica, or iron oxides
fossil
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Possible fossilized shell or fossil fragment
Indeterminate; possibly a small brachiopod or gastropod fossil in mineralized matrix
fossil
Fossilized wood, likely silicified petrified wood
Silicified wood (fossil wood; commonly quartz/chalcedony replacing organic tissue)
fossil
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
sedimentary
Chert / River Cobble
Microcrystalline Quartz (SiO2)
sedimentary
Crinoid and Coral Fossils in Limestone
Fossiliferous Limestone with Rugosa (order) and Crinoidea (class)
sedimentary
Fossil Shark Tooth (embedded in matrix)
Lamniformes (likely Cretalamna or Squalicorax) within phosphatic/calcareous matrix
sedimentary
Petrified Wood
Silicified wood (principally Silicon Dioxide, SiO2)
sedimentary
Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Seashell Fossil
Mollusca (Bivalvia)
fossil
Obsidian and Fossilized Shark Tooth
Obsidian (Volcanic Glass) and Otodus sp. (Fossilized shark tooth)
igneous and fossil
Fossilized Shark Tooth (Otodus)
Otodus sp. (calcium phosphate/hydroxylellite)
sedimentary
Fossilized bone or tooth fragment
Mineralized vertebrate bone; exact taxon indeterminate from image
fossil
Calcite
Calcium Carbonate (CaCO3)
mineral
Amber
Succinurite (C10H16O)
mineraloid
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Fragments
sedimentary
Marble (Sculpted Statue)
Metamorphic Limestone (composed primarily of Calcite, CaCO3)
metamorphic
Orbicular Jasper (Eye Jasper / Kambaba-like pattern)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate - CaCO3
sedimentary
Amber
Succinite (specifically for Baltic amber); chemical formula approximately C10H16O
Mineraloid
Chert / Flint Pebble
Chert (SiO2)
sedimentary
Amber
Succinite (fossilized resin)
mineral
Brachiopod or Bivalve Fossil in Limestone
Phylum Brachiopoda or Bivalvia (embedded in Calcium Carbonate matrix)
fossil
Pearl
Calcium carbonate (CaCO3) in the form of aragonite or calcite
mineral
Fossilized Syringopora (Piping Organ Coral)
Syringopora (Extinct Genus of Tabulate Coral)
sedimentary
Black Pearl (Tahitian-style Cultured Pearl)
Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)
mineral