Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
Category
Browse sedimentary (artificial) specimens identified by the Rock Identifier community.
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
Brachiopod Fossil in Sedimentary Matrix
Phylum Brachiopoda in Siltstone/Mudstone matrix
Banded Sedimentary Rock
Sedimentary rock with mineral veins/banding
Shale
Sedimentary pelitic rock
Weathered sandstone fragment
Quartz-rich sandstone, likely ferruginous sandstone
Quartz-veined Sandstone
Quartzite-veined Arenite / SiO2 and quartz sand
Ironstone Concretion / Chert Nodules
Iron-rich Sedimentary Concretion (Fe2O3 / SiO2 mix)
Ironstone (Limonite/Hematite concretion)
Ferruginous Siltstone / Goethite (FeO(OH))
Shale
Shale (fine-grained clastic sedimentary rock)
Orange Calcite
Calcium Carbonate (CaCO3)
Pyrite
Iron Sulfide (FeS2)
Celestine (Celestite)
Strontium sulfate (SrSO4)
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
Quartz
Silicon Dioxide (SiO2)
Quartz (Chert / Agate / Chalcedony)
Silicon Dioxide (SiO2)
Yellow Ocher (Iron-rich Silt/Clay)
Goethite-rich Limonite (FeO(OH)qnH2O)
Orange Calcite
Calcium Carbonate (CaCO3)
Yellow Calcite
Calcium Carbonate (CaCO3)
Yellow Calcite
Calcium Carbonate (CaCO3)
Rounded brown pebble, likely weathered sandstone or iron-stained quartzite
Probable quartz-rich sandstone (SiO₂-dominated); exact identification requires testing
Shale (or Mudstone)
Clay mineral aggregate / Fine-grained siliciclastic sedimentary rock
Chert (Tan/Yellow variety)
Microcrystalline quartz (SiO2)
Sandstone (Ferruginous)
Arenite with Iron Oxide (Fe2O3) cement
Shale
Mudrock / Fissile Shale
Sandstone
Clastic sedimentary rock (primarily SiO2)
Banded Jasper (Mookaite / Chert)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Fossil Coral
Tabulate Coral (potentially Favosites or Calapoecia)
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
Knightia Fossil in Limestone
Knightia eocaena in micritic limestone
Puddingstone (Gowganda)
Gowganda Formation Conglomerate
Chert (Common Opal/Chalcedony variety)
Microcrystalline Quartz (SiO2)
Fossil Shell
Invertebrate fossil (Mollusca)
Agate
SiO2
Fossiliferous Limestone with Brachiopod
Phylum Brachiopoda in calcitic matrix
Lepidodendron Fossil in Sandstone
Lepidodendron (Lycophytina, Lepidodendrales)
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Red sandstone
Quartz-rich sandstone, commonly ferruginous (Fe-oxide stained)
Chert (Jasper/Opaline variety)
Silicon Dioxide (SiO2)
Conglomerate
Conglomerate (Sedimentary Rock)