Siltstone
Siltstone (Clastic Sedimentary Rock)
sedimentary
Category
Sedimentary
Browse sedimentary specimens identified by the Rock Identifier community.
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Sandstone (Greywacke)
Arenite / Clastic Sedimentary Rock
sedimentary
Vesicular Sandstone
Clastic Sedimentary Rock (Sandstone)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Jasper-Quartz Conglomerate / Chert
Siliceous Sedimentary Rock (SiO2)
sedimentary
Travertine (Tufa)
Chemical Sedimentary Limestone (CaCO3)
sedimentary
Sandstone or Mudstone
Sedimentary Rock (Sandstone/Mudstone)
sedimentary
Chert (v. Flint)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Banded Agate
Sedimentary Cryptocrystalline Quartz (SiO2)
mineral
Shale with Iron Staining
Fissile Argillaceous Sedimentary Rock
sedimentary
Limestone with Calcite Veining
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Chert (variably Oolitic or Fossiliferous)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Conglomerate
Clastic sedimentary rock (Psephite)
sedimentary
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Sandstone (Pebble)
Arenite / Clastic Sedimentary Rock
sedimentary
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Banded Chert
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Puddingstone (Conglomerate)
Conglomerate (clastic sedimentary rock)
sedimentary
Siltstone
Siltstone (siliciclastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Weathered stone pebble (exact rock type indeterminate)
Unidentified fine-grained rock; composition cannot be determined from the image
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Red jasper (likely polished/tumbled)
Jasper, microcrystalline quartz (SiO₂) colored by iron oxides
mineral
Polished brecciated jasper (likely ocean jasper or brecciated agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions and possible chalcedony
gemstone
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
Limestone (or Sandstone)
Calcium Carbonate (CaCO3) / Silica (SiO2)
sedimentary
Quartz geode (likely chalcedony-lined geode)
Silica geode: microcrystalline quartz/chalcedony with drusy quartz (SiO₂), possibly iron-oxide staining
mineral
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