Banded Iron Formation (BIF)
Banded Iron Formation
Sedimentary Rock
Category
Sedimentary (Biogenic Sediment Or Biological Remain)
Browse sedimentary (biogenic sediment or biological remain) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Biogenic Sediment Or Biological Remain) in the encyclopedia
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
sedimentary
Chert / Flint Pebble with Fossil Cavity
Silicon Dioxide (SiO2)
sedimentary
Chert (Red Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Goniatite Fossil
Order Goniatitida
fossil
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (Flint/Jasper variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Shark Tooth (Carcharocles/Otodus or Sand Tiger Shark Tooth)
Elasmobranchii (Fossilized Tooth)
fossil
Fossilized Trilobite or Mollusk Fragment
Phylum Arthropoda / Mollusca fossil in sedimentary matrix
fossil
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chalky limestone
Micritic limestone, primarily calcite (CaCO₃)
sedimentary
Brecciated jasper/chert
Microcrystalline quartz (SiO₂), with iron-oxide and clay inclusions
sedimentary
Sandstone (Quartzite-leaning)
Arenite (primarily SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Ironstone Concretion
Ironstone (Siderite/Limonite/Goethite)
sedimentary
Orthoceras Fossil Limestone
Orthoceras (extinct genus of cephalopod); Limestone matrix (CaCO3)
sedimentary
Favosites (Honeycomb Coral Fossil)
Favosites sp. (Phylum Cnidaria, Order Tabulata)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Ferruginous Sandstone (Ironstone)
Ferruginous Sandstone / Limonite-cemented Quartz Sandstone
sedimentary
Ammonite Fossil (Polished Section)
Ammonoidea (typically mineralized with Calcite CaCO3)
sedimentary
Quartz (Granular)
Silicon Dioxide (SiO2)
mineral
Likely tumbled jasper or iron-rich chert
Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing
mineral
Tumbled chalcedony (likely milky quartz)
Chalcedony, cryptocrystalline SiO₂; possibly quartz-rich chert
mineral
Iron-stained brecciated chert or jasper
Microcrystalline quartz (SiO₂), likely chert/jasper with iron-oxide staining
sedimentary
Likely weathered gray stone or chert fragment
Uncertain; possibly microcrystalline quartz (SiO₂)-rich chert
sedimentary
Red jasper / iron-rich chert
Microcrystalline quartz (SiO₂) colored by hematite/goethite
sedimentary
Weathered sandstone or siltstone
Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by silica, iron oxides, or carbonate
sedimentary
Chert or chalcedony fragment (possibly agate)
Microcrystalline quartz, SiO₂
sedimentary
Banded Siltstone
Siltstone with rhythmic bedding
sedimentary
Quartz and Mixed Sedimentary Rocks
Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Coral Fossil Rock (Syringopora)
Syringopora (Organ-pipe Coral fossil in Limestone matrix)
sedimentary