Likely vertebra fossil or bone fragment
Indeterminate fossilized vertebra; mineralized hydroxyapatite, commonly Ca₅(PO₄)₃(OH)
fossil
Category
Sedimentary (Fossilized Organic Remain)
Browse sedimentary (fossilized organic remain) specimens identified by the Rock Identifier community.
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Fossil Coral (Petoskey Stone or Favosites)
Favosites (specifically Hexagonaria percarinata if silica-replaced Michigan type)
sedimentary
Banded Iron Formation (BIF) with potential Stromatolite/Biogenic Trace
Ferruginous Chert / Banded Iron Formation (BIF)
sedimentary
Calamites (Fossil Plant)
Calamites (Genus), belonging to the class Equisetopsida
sedimentary
Belemnite Fossil (Guardsman Fossil)
Belemnitella spp. (Rostrum)
fossil
Oolitic Chert
Oolitic Microcrystalline Quartz (SiO2)
sedimentary
Tabulate Coral Fossil (Favosites)
Favosites (Commonly known as Honeycomb Coral)
sedimentary
Fulgurite
Lechatelierite (Silica glass tubes)
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (Scoria)
Basalt (Vesicular texture)
igneous
Fossilized Echinoid (Sea Urchin) or Brachiopod
Echinoidea / Invertebrate Fossil
fossil
Fossilized bivalve shell fragment
Fossil Mollusca, likely a bivalve (class Bivalvia); exact genus cannot be determined from the image
fossil
Petrified Coral (Agatized Coral)
Anthozoa (Agatized Fossil)
sedimentary
Quartzite
Quartzite (Metamorphosed Quartz Sandstone)
metamorphic
Honeycomb Coral Fossil (Favosites)
Favosites alpenensis
sedimentary
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Honeycomb Coral Fossil
Favosites (extinct genus of tabulate coral)
sedimentary
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
mineral
Fossilized Syringopora (Piping Organ Coral)
Syringopora (Extinct Genus of Tabulate Coral)
sedimentary
Fossil Coral
Hexagonaria / Rugose coral (Fossilized calcium carbonate)
fossil
Picture Jasper
Silicon Dioxide (SiO2) - Opaque Impure Chalcedony
sedimentary
Fossilized Bone (Petrified Bone)
Permineralized Bone Fossil
fossil
Sandstone (Quartzose / Feldspathic Sandstone)
Arenite (SiO2 principal matrix)
sedimentary
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartzite pebble
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2) with mineral inclusions
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Charoite
Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)
mineral
Polished fossilized wood (likely petrified wood)
Silicified wood; commonly quartz (SiO₂) replacing wood tissue
fossil
Fulgurite
Lechatelierite (Silica Glass)
mineral
Fulgurite
Lechatelierite (Silica glass tube)
mineral
Jasper (likely Kambaba or Crocodile Jasper variety)
Silicon Dioxide (SiO2) with inclusions
sedimentary
Fossilized Oyster (Devil's Toenail)
Gryphaea (extinct genus of bivalve mollusks)
sedimentary
Black Limestone
Bituminous Limestone (Calcium Carbonate - CaCO3)
sedimentary
Chert (with Calcite layering)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
sedimentary
Iridescent Ammonite
Ammonoidea (Species: likely Cleoniceras or Desmoceras); Mineral: Aragonite/Ammolite (CaCO3)
sedimentary (fossilized)
Amethyst
Silicon Dioxide with Iron impurities (SiO2 + Fe3+)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet.
fossil
Chert (Jasper/Chalcedony mix)
Microcrystalline Quartz (SiO2)
sedimentary
Diorite (Porphyritic) / Granite
Plutonic Igneous Rock (Granodiorite / Diorite)
igneous