Sedimentary (Silicified Fossiliferous Chalcedony)

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Sandstone (Tumbled/River Pebble)

Arenite (composed primarily of SiO2)

Limonite / Ironstone Nodule

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

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate

Conglomerate (clastic sedimentary rock)

Chert (often called Flint when dark)

Sedimentary cryptocrystalline quartz (SiO2)

Sandstone

Sandstone (Sedimentary rock composed of silicate grains)

Sandstone

Arenite (primarily SiO2)

Conglomerate

Clastic sedimentary rock (Polymictic Conglomerate)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Bituminous Coal

Organic Sedimentary Rock (Carbon-based)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Sandstone (River Pebble)

Arenite (primarily SiO2)

Sandstone Pebbles

Arenite (Sedimentary rock composed of sand-sized grains)

Sandstone

Arenite (SiO2 based)

Sandstone

Clastic Sedimentary Rock (composed of SiO2 grains)

Glauconite (Sandstone or Shale)

Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Arenite (primarily SiO2)

Metaconglomerate

Metaconglomerate (Quartzite conglomerate)

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Amber-bearing Coal/Sedimentary Rock

Bituminous coal or carbonaceous siltstone with Fossilized Tree Resin (C10H16O)

Conglomerate

Conglomerate (Detrital Sedimentary Rock)

Sandstone concretion (Ironstone-stained)

Arenite with Limonite/Hematite staining (Silica-based with Iron Oxides)

Coal

Bituminous or Anthracite coal (carbon-rich sedimentary rock)

Sandstone (likely Ferruginous)

Arenite (SiO2 based with Fe2O3/FeO(OH) cement)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cementation)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone with Quartz Vein

Arenite with SiO2 intrusion

Sandstone (Water-worn Cobble)

Arenite (SiO2 based)

Chert / Flint

Cryptocrystalline quartz (SiO2)

Shale

Fissile mudstone (primarily clay minerals and silt-sized quartz)

Sandstone (likely Quartz Sandstone)

Arenite (SiO2 based)

Sandstone

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxide)