Shale
Shale (clay-sized silicate minerals)
sedimentary
Category
Sedimentary (Biogenic Sediment Or Biological Remain)
Browse sedimentary (biogenic sediment or biological remain) specimens identified by the Rock Identifier community.
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Shale
Fissile Clay-dominant Mudrock (SiO2, Al2O3, K2O, Na2O, CaO, MgO)
sedimentary
Iron-rich chert or jasper pebble
Microcrystalline quartz (SiO₂), colored by iron oxides
sedimentary
Fossilized Crinoid Stem Segment
Crinoid (Phylum Echinodermata, Class Crinoidea)
sedimentary
Fossilized Echinoid Fragment (Calycinal/Boss Fossil)
Echinodermata fossil fragment
fossil
Green Chert
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus)
fossil
Howlite (White Buffalo Turquoise)
Howlite (Calcium Borosilicate Hydroxide), Ca2B5SiO9(OH)5
mineral
Fossil Bivalve / Ostreid Shell (Hag Stone / Perforated Pebble)
Phylum Mollusca, Class Bivalvia
fossil
Fossilized Bone Chunk
Permineralized Vertebrate Bone (indeterminant)
fossil
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class) - likely replaced by Calcite or Quartz
sedimentary
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Banded Chert
Silicon dioxide (SiO2)
sedimentary
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Banded Chert / Cryptocrystalline Quartz
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite
sedimentary
Fossil Brachiopod or Mollusk Cast
Phylum Brachiopoda / Mollusca internal mold
fossil
Sandstone (Ferruginous)
Arenite with Iron oxide staining (SiO2 with Fe2O3)
sedimentary
Amber
Amber (C10H16O)
mineral
Fossilized Wood (Petrified Wood) and Associated Rocks
Silicified Wood / Xylopal
fossil
Yellow Jasper
Chalcedony (SiO2)
sedimentary
Red Jasper
Jasper (SiO2) - Silicon Dioxide with Hematic impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Ironstone Concretion
Siderite or Hematite-bonded Concretion
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - variety Jasper
sedimentary
Conglomerate
Conglomerate (SiO2 matrix with various inclusions)
sedimentary
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Weathered chert or siliceous limestone
Microcrystalline quartz (SiO₂), possibly with carbonate minerals
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Ironstone Concretion
Siderite or Ferruginous Concretion (FeCO3 or Iron Oxides)
sedimentary
Calcite
Calcite (Mineral; CaCO₃)
Mineral
Fossilized Ripple Marks or Stromatolite
Sedimentary ripple mark imprint / Biosedimentary structure
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Vein-filled Sedimentary Rock
Silicified sedimentary rock with quartz/calcite vein
sedimentary
River Pebble (Quartz/Chert mix)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
sedimentary
Chert (Jasper/River Rock)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite / Ironstone Concretion
Hydrated Iron Oxide (FeO(OH)%C2%B7nH2O)
sedimentary