Sandstone
Arenite (SiO2 principal)
sedimentary
Category
Sedimentary
Browse sedimentary specimens identified by the Rock Identifier community.
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Fossil Shell
Phylum Mollusca (Bivalvia or Brachiopoda)
fossil
Iron-stained quartz (likely quartzite or quartz-rich rock)
Quartz, silicon dioxide (SiO₂), with iron-oxide staining
mineral
Granite Pebble
Intrusive Igneous Rock
igneous
Siltstone Pebble
Siltstone
sedimentary
Travertine (or Calcareous Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Chert / Chalcedony Nodule
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
mineral
River Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Pyrite (on Shale/Matrix)
Iron Disulfide (FeS2)
mineral
Conglomerate
Clast-supported polymictic conglomerate
sedimentary
Conglomerate
Clast-supported polymict conglomerate
sedimentary
Fossil bivalve or brachiopod in sedimentary rock
Unidentified fossil shell impression; likely a ribbed bivalve or brachiopod preserved in shale/siltstone
fossil
Rounded iron-rich pebble, likely lateritic sandstone or ferruginous conglomerate fragment
Hematite/goethite-bearing ferruginous sediment; exact identification requires testing
sedimentary
Iron-rich chert or jasper
Microcrystalline quartz (SiO₂), stained by hematite/goethite
sedimentary
Calcite crystal cluster
Calcite (calcium carbonate, CaCO₃), likely honey or amber calcite
mineral
Possible flint (chert) fragment
Microcrystalline quartz (SiO₂), commonly called flint when dark and nodular
sedimentary
Tumbled brown quartz/chert pebble
Microcrystalline quartz (SiO₂), possibly chert or jasper
mineral
Geode (Unopened)
Siliceous Septarian Concretion / Geode (SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with marine fossils
fossil
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Painted Rock
Weathered Sedimentary Rock (Painted)
sedimentary
Tumbled Agate
Silicon Dioxide (SiO2)
gemstone
Sandstone
Sedimentary rock composed mainly of quartz sand grains
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)
sedimentary
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Fossiliferous Limestone (or Bryozoan/Coral Fossil Pebble)
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Chert
Chert (variant of microcrystalline quartz)
Sedimentary
Sandstone or Mudstone
Sedimentary Rock (Sandstone/Mudstone)
sedimentary
Cockle Shell Fossil
Cardiidae family (Bivalvia)
fossil
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2), Microcrystalline Quartz
sedimentary
Cannonball Concretion
Calcite-cemented Sandstone Concretion
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Seashell Fossil
Gastropoda fossil
fossil
Fossilized Tooth Fragment
Vertebrate Fossil (Mammalia indet.)
fossil
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary