Petrified Coral Fossil
Rugose or Tabulate Coral (Hexagonaria or similar fossilized cnidarian)
fossil
Category
Sedimentary (Fossilized Organic Remain)
Browse sedimentary (fossilized organic remain) specimens identified by the Rock Identifier community.
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Fossil Coral (likely Favosites or Honeycomb Coral)
Class Anthozoa, Order Tabulata, Genus Favosites
sedimentary
Sandstone
Arenite (mainly SiO2 with varying cements)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Petoskey Stone (Coral Fossil)
Hexagonaria percarinata (Fossilized colonial rugose coral)
sedimentary
Picture Jasper
Jasper (Silicon Dioxide, SiO2 with impurities)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Belemnite (Fossilized Rostrum)
Belemnitida (order), specifically Neohibolites or similar genera depending on age
sedimentary
Granite
Intrusive Igneous Rock (Felsic)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Unakite
Unakite Epidosite (composite of Epidote, Orthoclase, and Quartz)
metamorphic
Petrified Wood
Silicified wood (Quartz/Chalcedony)
Sedimentary
Devil's Toenail (Fossil Oyster)
Gryphaea arcuata (Calcium Carbonate, CaCO3)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Fossilized Horn Coral
Rugosa
fossil
Rugose Coral Fossil
Order Rugosa
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Amber
Succinates (C10H16O)
mineraloid
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Mookaite Jasper
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Amber
Succinite
Mineraloid
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Dendritic Chert
Silicon Dioxide with Manganese Oxide Inclusions (SiO2 + MnO2)
sedimentary
Sandstone
Arenite (SiO2 with various cementation agents)
sedimentary
Sandstone with Dendritic Manganese Oxides
Sandstone (SiO2 predominant) with Oxide Dendrites (MnO2)
sedimentary
Orbicular Jasper (Eye Jasper / Kambaba-like pattern)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Sandstone Concretion
Sandstone (Sedimentary Rock) with silica or calcite cement
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (River Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Likely tumbled amber or orange chalcedony
Uncertain from image; possibly amber (fossilized resin, chiefly C10H16O) or carnelian (microcrystalline quartz, SiO₂)
gemstone
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Orthoceras Fossil Limestone
Orthoceras (extinct genus of cephalopod); Limestone matrix (CaCO3)
sedimentary
Mixed polished gemstone bead lot, likely dyed agate and quartz
Chalcedony (microcrystalline quartz, SiO₂), with possible amethyst, aventurine, and other dyed quartz varieties
gemstone