Sedimentary Rock (Specifically A Clastic Sedimentary Rock Formed Into A Cobble)

Greywacke (River/Beach Pebble)

Greywacke (Impure Sandstone)

Breccia

Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)

Sandstone

Arenite (SiO2 primarily)

Sandstone with Calcite Vein

Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling

Sandstone

Arenite (primarily Quartz, SiO2)

Coquina

Bioclastic Limestone

Sandstone (with cross-bedding)

Arenite (composed primarily of Quartz: SiO2)

Sandstone (likely Graywacke or Lithic Sandstone)

Arenite / Wacke (SiO2 based with lithic fragments)

Sandstone (with garnet granules)

Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)

Gneiss (specifically Granitic Gneiss)

Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)

Wishing Stone

Greenschist or Basalt with Quartz/Calcite Vein

Conglomerate with Fossilized Shark Teeth

Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains

Sandstone with Tafoni Weathering

Arenite (SiO2 based)

Jasper (specifically Red or Brecciated Jasper variant)

Jasper (Microcrystalline Quartz - SiO2)

Sandstone

Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)

Banded Sandstone (Zebra Stone)

Arenite with Iron Oxide Banding (Liesegang rings)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Agate (specifically Carnelian Agate or Lake Superior style Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Granite Cobble

Phaneritic Plutonic Felsic Rock

Red Sandstone Pebble

Arenite (primarily Quartz SiO2 with Hematite Fe2O3 staining)

Fossiliferous Brachiopod in Shale

Brachiopoda (Phylum) preserved in Carbonaceous Shale

Ferruginous Sandstone

Sandstone (arenite) with Limonite/Goethite cement

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Greywhacke (River Pebble)

Graywacke (immature sandstone)

Ferruginous Sandstone

Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)

Sandstone

Arenite (composed primarily of SiO2)

Quartz / Chert

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Quartz Crystal (specifically a small Clear Quartz point)

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate Rock (Paraconglomerate)

Granite Cobble

Phaneritic Felsic Igneous Rock (Granite)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)

Granite Cobble

Phaneritic Felsic Igneous Rock

Sandstone

Arenite (primarily SiO2)

Ferruginous Sandstone (Gerrit)

Arenite with Iron Oxide cementation

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Conglomerate

Conglomerate (lithified rudite)

Sandstone with Liesegang Rings

Arenite with Iron Oxide Liesegang Banding

Banded Siltstone or Argillite

Siltstone (primarily SiO2 with Al and Fe oxides)