Chert
Microcrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Artificial)
Browse sedimentary (artificial) specimens identified by the Rock Identifier community.
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Zebra Stone (Banded Chert or Limestone)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Chert (River Pebble)
Chert (Silica, SiO2)
sedimentary
Concretion with Quartz Veining
Septarian Concretion (CaCO3 / SiO2)
sedimentary
Chert (Red/Brown Variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Flint variety)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Hematite or Goethite-rich Ironstone
Ironstone (Oxidized Iron Ore)
sedimentary
Jasper in Calcite / Brecciated Jasper
Silicon dioxide with calcium carbonate (SiO2 with CaCO3)
sedimentary
Jasper
Microcrystalline Quartz (SiO2) with impurities
sedimentary
Chert / Flint
Silicon dioxide (SiO2)
sedimentary
Jasper Chert Nodules
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Bituminous Coal
Bituminous coal (Carbonaceous sedimentary rock)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite / Arkose)
sedimentary
Sandstone (Pebble)
Sandstone (SiO2 dominated clastic sedimentary rock)
sedimentary
Fine-grained gray sandstone or quartz-rich sedimentary pebble
Likely quartz arenite or lithic sandstone; exact identification requires microscopy or testing
sedimentary
Sandstone
Arenite (SiO2 based with cement)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Halite
Sodium chloride (NaCl)
mineral
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Sedimentary Rock
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Brown Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Shale (possibly)
Shale (fine-grained clastic sedimentary rock)
sedimentary
Sandstone with Hematite staining
Arenite with Fe2O3 inclusions
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Quartzose)
Sandstone (Principally SiO2)
sedimentary
Sandstone (likely Greywacke variant)
Arenite
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 predominantly)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)
sedimentary
Agate / Chalcedony
Silicon dioxide (SiO2)
mineral
Ironstone / Limonite Concretion
Hydrated Iron Oxide Rock (FeO(OH)·nH2O with SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper / Chalcedony
Silicon Dioxide (SiO2) with iron inclusions
mineral
Yellow Jasper
Silica (Silicon Dioxide, SiO2) with iron inclusions
sedimentary
Sandstone (with Iron Staining)
Sandstone (mainly Quartz, SiO2, with Iron Oxides like Goethite/Hematite)
sedimentary
Gypsum (Satin Spar/Desert Rose variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Quartz-rich sandstone or granitic fragment
Likely quartz–feldspar sandstone; exact identification is uncertain from the photograph
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary