Banded Sedimentary Rock (Siltstone/Mudstone with concretion)
Siltstone with Ferruginous Banding
sedimentary
Category
Sedimentary (Anthropogenic)
Browse sedimentary (anthropogenic) specimens identified by the Rock Identifier community.
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Sedimentary River Rock
Siliciclastic Sedimentary Rock (Quartzite or Sandstone pebble)
sedimentary
Weathered sandstone
Quartz-rich sandstone, likely arkose or feldspathic sandstone
sedimentary
Weathered limestone fragment
Calcite-rich limestone (CaCO₃), possibly fossiliferous or brecciated
sedimentary
Chert (Chalcedony-rich sedimentary rock)
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone
Clastic Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone (likely Arkose or Lithic)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Rounded sedimentary pebble, likely mudstone or shale
Argillite/mudstone; predominantly compacted clay minerals with quartz and iron oxides
sedimentary
Iron-rich concretion or weathered ironstone
Limonite/goethite-rich ironstone; commonly hydrated iron oxides (FeO(OH)·nH₂O)
sedimentary
Blue-gray layered sedimentary pebble
Likely micaceous shale or slate; exact identification requires testing
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Sandstone
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Sandstone with Iron Oxide Coating
Arenite (SiO2 with Fe2O3 impurities)
sedimentary
Conglomerate
Conglomerate rock
sedimentary
Sandstone (Ferruginous)
Arenite (with Goethite/Limonite cement)
sedimentary
Sedimentary Rock with Crafts (Pet Rock)
Sedimentary rock decorated with synthetic materials
sedimentary
Fossilized Shell Fragment
Bivalvia or Gastropoda (depending on original organism)
fossil
White Howlite (likely)
Howlite, Ca₂B₅SiO₉(OH)₅
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Red Jasper (with Chert/Quartz)
Silicon Dioxide (SiO2)
sedimentary
Jasper (likely Iron-stained)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Orange Calcite (likely polished specimen)
Calcite
Mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
Mineral
Weathered Pyrite Nodule
Iron Sulfide (FeS2) undergoing oxidation to limonite/goethite
mineral
Polished jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Quartz (Variety: Agate / Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Raw selenite (gypsum)
Gypsum, CaSO₄·2H₂O; translucent variety selenite
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartz Arenite)
sedimentary
Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)
sedimentary
Sedimentary Strata of the Badlands (Mudstone, Siltstone, and Sandstone)
White River Group (Brule and Chadron Formations)
sedimentary
Jasper (Sedimentary variety)
Silicon Dioxide (SiO2) with impurities
sedimentary
Chalk (Sedimentary Pebble)
Calcium Carbonate (CaCO3) - Biogenic Limestone
sedimentary