Fossilized Brachiopod
Brachiopoda (e.g., Rhynchonellida or Spiriferida)
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
Browse sedimentary (fossilized organic matter) specimens identified by the Rock Identifier community.
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Geode / Fossilized Gastropod or Shell Cast
Silicon dioxide (Quartz) replacement / fossil mold
sedimentary
Pearl (in a decorative hair comb setting)
Calcium carbonate (CaCO3) primarily as Aragonite, bonded with Conchiolin
Organic Mineraloid
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Rough amber-like brown mineral specimen
Uncertain from photograph; possibly iron-stained quartz, common opal, or resinous amber
mineral
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Fossilized Echinoid
Echinoidea (likely of the order Echinoidea)
fossil
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2)
metamorphic
Fossilized oyster or bivalve shell
Fossil Gryphaeidae or Ostreoidea; calcitic shell, CaCO₃
fossil
Fossiliferous Limestone with Crinoid stems
Limestone (CaCO3) containing Crinoidea fossils
sedimentary
Petoskey Stone (Fossilized Rugose Coral)
Hexagonaria percarinata
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Coprolite
Fossilized feces (various taxa)
sedimentary
Fossilized Brachiopod
Phylum Brachiopoda (likely Order Spiriferida or Orthida)
fossil
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Fossilized Coral
Rugosa / Tabulata coral fossils replaced by silica (Chalcedony/Quartz)
fossil
Fossiliferous Mudstone / River Pebble
Sedimentary rock with trace fossil or inclusion
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Ferruginous Siltstone or Mudstone
Ferruginous Siltstone / Goethitic Sandstone
sedimentary
Ferruginous Sandstone (with ripple marks)
Arenite with Iron-Oxide (Fe2O3) cement
sedimentary
Sandstone
Arenite (Secondary classification based on grain size)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (composed of SiO2, CaCO3, or iron oxides)
sedimentary
Fossil Sea Urchin / Echinoid
Class Echinoidea
fossil
Mookaite Jasper
Siliceous (chert) sedimentary rock, a form of Jasper
Sedimentary
Crinoid Fossil Limestone
Crinoidal Limestone (Calcite / CaCO3)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Fossilized Stromatolite (Cyanobacteria microfossils in silica Matrix)
sedimentary
Brachiopod Fossil
Phylum Brachiopoda (replaced by Calcite or Silica)
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Fossilized Coral
Rugose Coral (Order Rugosa) or Tabulate Coral
fossil
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Amber
Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Anthracite Coal
Anthracite (Carbon rank)
sedimentary
Concretion
Septarian Concretion
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Snakeskin Jasper
Microcrystalline Quartz (SiO2) with iron inclusions
sedimentary
Sandstone with Liesegang Rings
Clastic Sedimentary Rock with Iron Oxide Precipitates (SiO2 + Fe2O3)
sedimentary
Quartz Conglomerate
Quartz Conglomerate (clastic sedimentary rock)
sedimentary