Fossilized Coral (Petoskey Stone or similar)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Category
Sedimentary (Fossilized Organic Remains)
Browse sedimentary (fossilized organic remains) specimens identified by the Rock Identifier community.
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Fossilized Oyster Shell
Ostreidae (Calcium Carbonate - CaCO3)
fossil
Sandstone
Quartz Arenite
sedimentary
Coquina Jasper
Fossiliferous Chalcedony (SiO2)
sedimentary
Sandstone
Sandstone (principally SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Chert Nodules (with Gryphaea or Shell inclusions)
Microcrystalline Quartz (SiO2) with Calcitic inclusions
sedimentary
Green Chert (Jasper)
Microcrystalline Quartz (SiO2) with chlorite/epidote inclusions
sedimentary
Amber (and Citrine Quartz)
Succinite (Amber) and Silicon Dioxide (SiO2)
Organic Mineraloid and Mineral
Amber
Succinite (Formula: C10H16O)
Organic Mineraloid
Kambaba Jasper
Stromatolite (Microbial mat fossil in silicified sediment)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Dendrite (Manganese Oxide Dendrites)
Psilomelane or Pyrolusite on Matrix (typically MnO2)
mineral
Cockle Shell (Bivalve)
Cardiidae (Calcium Carbonate, CaCO3)
fossil
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda embedded in sedimentary rock
fossil
Amber
Fossilized Tree Resin (Amorphous Hydrocarbon)
Mineral
Petoskey Stone
Hexagonaria percarinata
sedimentary
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Sandstone (Banded)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Echinoid Fossil in Flint or Chert Nodule
Echinoidea embedded in sedimentary silica (SiO2)
fossil
Chert Pebble with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Tan/Brown Chert)
Chert (SiO2)
sedimentary
Sandstone
Arenite (SiO2 secondary)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Staghorn Coral Specimen
Acropora cervicornis (Calcium Carbonate, CaCO3)
sedimentary
Cowrie Shell Fossil
Cypraea sp.
fossil
Fossilized Brachiopod in Limestone
Phylum Brachiopoda embedded in sedimentary limestone
fossil
Sandstone
Arenite (SiO2 primarily)
sedimentary
Amber (specifically Burmese Amber or Burmite)
Succiniferous fossil resin (C10H16O)
mineraloid
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites sp. (Extinct genus of tabulate coral)
sedimentary
Tumbled amber
Fossilized tree resin; commonly succinite (organic resin, not a mineral)
fossil
Sandstone
Arenite (mainly SiO2 with varying cements)
sedimentary
Sandstone
Arenite
sedimentary
Fossil Coral (likely Favosites or Honeycomb Coral)
Class Anthozoa, Order Tabulata, Genus Favosites
sedimentary
Ammonite Fossil
Ammonoidea subclass (calcium carbonate / silica replacement)
fossil
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Petrified Coral Fossil
Rugose or Tabulate Coral (Hexagonaria or similar fossilized cnidarian)
fossil