Sandstone
Arenite (SiO2 primarily)
sedimentary
Category
Sedimentary (Fossilized Organic Remains)
Browse sedimentary (fossilized organic remains) specimens identified by the Rock Identifier community.
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Petoskey Stone (Coral Fossil)
Hexagonaria percarinata (Fossilized colonial rugose coral)
sedimentary
Picture Jasper
Jasper (Silicon Dioxide, SiO2 with impurities)
sedimentary
Baltic Amber (Butterscotch variety)
Succinite
Organic Gemstone/Mineraloid
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Devil's Toenail (Fossil Oyster)
Gryphaea arcuata (Calcium Carbonate, CaCO3)
sedimentary
Fossilized Horn Coral
Rugosa
fossil
Belemnite (Fossilized Rostrum)
Belemnitida (order), specifically Neohibolites or similar genera depending on age
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Rugose Coral Fossil
Order Rugosa
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Chert (specifically Jasper or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Mookaite Jasper
Siliceous sedimentary rock (variety of Jasper/Chert)
Sedimentary Rock
Amber
Succinite (Approximate formula: C10H16O)
Mineraloid
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Fossiliferous limestone
Bioclastic carbonate rock, chiefly calcite (CaCO₃), containing a likely colonial coral or bryozoan fossil
fossil
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
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
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Belemnite Fossil
Belemnitella sp. (rostrum)
fossil
Orthoceras Fossil Limestone
Orthoceras (extinct genus of cephalopod); Limestone matrix (CaCO3)
sedimentary
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartz Arenite)
Sandstone (SiO2 with possible mineral cements)
sedimentary
Pink Coral
Corallium rubrum (or related species, composed of calcium carbonate)
gemstone
Sandstone (Flagstone)
Arenite (composed primarily of SiO2)
sedimentary
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus)
fossil
Fossil Belemnite Guard
Belemnitella spp. (rostrum)
fossil
Crinoid Stem Fossil in Matrix
Phylum Echinodermata, Class Crinoidea
fossil
Kambaba Jasper
Stromatolite (Fossilized Algae within Microcrystalline Quartz)
sedimentary
Sandstone with attached barnacles
Quartz sandstone (Silicon Dioxide - SiO2 matrix)
sedimentary
Sandstone Cobble
Arenite (primarily SiO2)
sedimentary