Sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Chert (within Limestone)

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Sandstone

Arenite (Sandstone)

Sandstone

Arenite (SiO2 primarily)

Sandstone (likely Quartz Sandstone)

Arenite (SiO2 based)

Sandstone

Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2)

Chert Nodule

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (primarily Quartz-rich sedimentary rock)

Stromatolite

Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)

Sandstone (Ferruginous)

Arenite (Fe-bearing Clastic Sedimentary Rock)

Coal (Bituminous or Anthracite)

Carbonaceous sedimentary rock (primarily Carbon, C)

Calcite

Calcium Carbonate (CaCO3)

Hematite

Hematite, Iron(III) oxide (Fe2O3)

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Weathered Pebble)

Arenite (composed primarily of SiO2)

Sandstone

Arenite

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Limestone (Beach Pebble)

Sedimentary Calcium Carbonate (CaCO3)

Limestone (Weathered Aggregate)

Sedimentary Carbonate Rock (CaCO3)

Sandstone

Arenite (Siliclastic sedimentary rock)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Limonite / Ironstone Nodule

Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O

Geode (Unopened)

Silicon Dioxide (SiO2) in sedimentary vugs

Travertine

Terrestrial Sedimentary Calcite (CaCO3)

River Stone (River Rock)

Smooth Clastic Sedimentary Rock

Chert (often called Flint when dark)

Sedimentary cryptocrystalline quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone Pebble

Arenite (SiO2 with minor mineral cements)

Sea Shell Fragment (Calcium Carbonate)

Aragonite / Calcite (CaCO3)

Sandstone (lithic wake or graywacke)

Clastic sedimentary rock (primarily quartz and lithic fragments)

Sandstone

Arenite (SiO2 primarily)

Sandstone (Iron-stained)

Arenite (primarily SiO2 with Fe2O3 staining)

Limestone

Sedimentary rock composed of Calcium Carbonate (CaCO3)

Dalmatian Jasper

Peralkaline rhyolite with arfvedsonite inclusions

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Limonite-stained)

Microcrystalline Quartz (SiO2) with iron oxides

Sandstone Pebbles

Arenite (Sedimentary rock composed of sand-sized grains)

Sandstone

Arenite (SiO2 based)

Banded Sandstone (Liesegang Rings)

Arenite with Liesegang rings (SiO2/Fe2O3)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)