Sedimentary Rock

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide cement)

Shale

Fissile Mudstone

Sandstone (likely Siltstone or Mudstone)

Clastic sedimentary rock (primarily SiO2 with various oxides)

Sandstone (Calcareous or Ferruginous)

Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)

Ferruginous Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains)

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz, SiO2)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Limestone

Calcareous sedimentary rock (primarily Calcium Carbonate, CaCO3)

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Shale with Pyrite

Clastic sedimentary rock containing Iron Disulfide (FeS2)

Sandstone

Arenite (primarily SiO2)

Shale with Iron Oxide Staining

Fissile Mudstone (primarily clay minerals and quartz)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Chert (specifically Tan/Yellow Chert)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Hag Stone (Sandstone with Boreholes)

Bored Sandstone (Sedimentary rock with lithophaga-style borings)

Ferruginous Sandstone

Clastic Sedimentary Rock (Sandstone with Iron Oxide cement)

Chert / Flint Nodules in Sandstone

Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock

Sandstone (with Iron Staining)

Clastic sedimentary rock (High Silica / Iron Oxide)

Siltstone with flute casts or scratch marks

Clastic Sedimentary Rock (Siltstone/Fine-grained Sandstone)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Sandstone (likely Siltstone or Mudstone variety)

Clastic Sedimentary Rock (primarily SiO2 with iron oxides)

Ferruginous Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)

Sandstone with Magnetite and Iron Staining

Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)

Limestone

Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)

Milky Quartz in Conglomerate Matrix

Silicon Dioxide (SiO2) within Clastic Sedimentary Rock

Ironstone

Ferruginous Sedimentary Rock (composed of Goethite, Hematite, and Limonite)

Red Sandstone (Iron-stained)

Clastic sedimentary rock (primarily Quartz with Iron Oxides)

Chert (includes Flint & Jasper)

Chert (Siliceous sedimentary rock, chemical formula SiO2)

Fossiliferous Shale Matrix

Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments

Limestone

Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)

Sandstone Beach Pebble

Clastic sedimentary rock (SiO2 with iron oxide cement)