Banded Iron Formation (BIF)
Banded Iron Formation (BIF), SiO2 / Fe2O3
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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Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Piddock bored rock (likely Mudstone or Shale)
Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock
sedimentary
Sandstone with Lichen
Arenite (SiO2 based) with biological weathering
sedimentary
Chert with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone containing marine invertebrate fossils
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Fossiliferous Limestone
CaCO3 (principally Calcite or Aragonite)
sedimentary
Chert (Flint variety)
Chert (SiO2)
sedimentary
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone Concretion
Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)
sedimentary
Banded Iron Formation (BIF) / Chert
Banded Iron Formation (SiO2 with Fe2O3 / Fe3O4)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Turritella Gastropod Fossil
Turritella (mollusk fossil in sedimentary matrix)
fossil
Chert Nodules with Iron Staining
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Weathered)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
sedimentary
Rough Amber (likely Copal or immature Amber)
Organic gemstone / Succinite (if Baltic)
mineral
Chert (Jasper/Mudstone variant)
Silicon Dioxide (SiO2)
sedimentary
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
sedimentary
Sandstone Concretion
Ferruginous Sandstone Concretion
sedimentary
Fossiliferous Limestone (Pink/Red)
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Limestone (specifically Marl or Chalk)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone with Algae Growth
Arenite with Chlorophyta/Lichen
sedimentary
Sandstone with Quartz Vein
Arenite with Crystalline Silica (SiO2)
sedimentary
Sandstone (Water-worn)
Arenite
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) matrix with biogenic fragments
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Limestone with Lichen
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper/Brown Chert)
Silicon Dioxide (SiO2)
sedimentary
Beach Pebbles and Quartz Aggregates
Quartz pebbles and biogenic fragments (SiO2, CaCO3)
sedimentary
Coquina
Biogenic Limestone (mostly Calcium Carbonate, CaCO3)
sedimentary
Iron-rich brown stone, possibly weathered chert or ironstone
Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)
sedimentary
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
sedimentary
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil