Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Category
Sedimentary (Fossilized Organic Remain)
Browse sedimentary (fossilized organic remain) specimens identified by the Rock Identifier community.
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Fossil Shark Tooth
Chondrichthyes dentition (Fossilized Tooth)
fossil
Fossilized Brachiopod Shell Fragment
Brachiopoda (Class: Rhynchonellata or Strophomenata)
fossil
Fossilized Brachiopod
Phylum Brachiopoda (Calcium Carbonate/Silica replacement)
sedimentary
Fossilized Brachiopod
Brachiopoda (Class Rhynchonellata or Spiriferida)
sedimentary
Fossilized Brachiopod
Brachiopoda (e.g., Rhynchonellida or Spiriferida)
sedimentary
Geode / Fossilized Gastropod or Shell Cast
Silicon dioxide (Quartz) replacement / fossil mold
sedimentary
Fossilized Shark Teeth
Carcharhiniformes or Lamniformes species (common mineral: Fluorapatite/Ca5(PO4)3F)
sedimentary (fossilized organic matter)
Amber
Succinite (specific to Baltic amber), fossilized tree resin
mineraloid
Amber
Succinite (C10H16O)
mineraloid
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Amber
Succinicum (Organic polymer, largely C10H16O)
Organic Mineral
Fossilized Echinoid
Echinoidea (likely of the order Echinoidea)
fossil
Fossilized oyster or bivalve shell
Fossil Gryphaeidae or Ostreoidea; calcitic shell, CaCO₃
fossil
Siderite Concretion (Nodule)
Iron Carbonate (FeCO3) Concretion
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Amber
Succinite
Organic (Mineraloid)
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite/Hematite and Chert)
sedimentary
Chalcedony (Agate/Seashell replacement)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Fossilized Brachiopod
Phylum Brachiopoda (likely Order Spiriferida or Orthida)
fossil
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
Amber
Succinite (C10H16O)
mineraloid
Dyed Blue Agate
Chalcedony (SiO2) with artificial dye
gemstone
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Fossil Sea Urchin / Echinoid
Class Echinoidea
fossil
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
Sedimentary Strata of the Badlands (Mudstone, Siltstone, and Sandstone)
White River Group (Brule and Chadron Formations)
sedimentary
Fossilized Coral
Rugose Coral (Order Rugosa) or Tabulate Coral
fossil