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

Sandstone (Quartzite Pebble)

Arenite (SiO2)

Sandstone

Arenite (SiO2 based with quartz grains)

River Rocks (Basalt and Sedimentary Stones)

Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock

Sandstone (likely Siltstone)

Arenite or Siltstone (high SiO2 content)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 + varied clasts)

Gneiss (River Cobble)

Gneiss (Foliated Metamorphic Rock)

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (Lithic Sandstone)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Greywacke/Lithic Sandstone)

Arenite / Lithic Sandstone

Brecciated Chert

Sedimentary Chert (SiO2) with Calc-Silicate mineralization

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Sandstone

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

Sandstone (Wonderstone)

Arenite (composed primarily of SiO2 with Fe2O3 impurities)

Conglomerate

Conglomerate rock

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (Quartzose)

Sandstone (clastic sedimentary rock, primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Sandstone

Arenite (primarily SiO2)

Jasper

Silicon dioxide (SiO2) with impurities

Weathered Sandstone with Algae Growth

Arenite

Ferruginous Sandstone (with possible Epidote/Chlorite coloring)

Sandstone (SiO2 dominated with Fe2O3 staining)

Ferruginous Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Sandstone (Calcareous Sandstone)

Calcareous Sandstone (primarily SiO2 with CaCO3 cement)

Sandstone

Arenite (SiO2 based)

Sandstone (Quartzose Pebble)

Clastic sedimentary rock (primarily SiO2)

River Cobble (Basaltic/Andesitic)

Mafic Igneous Porphyritic Rock

Sandstone

Arenite (Siliclastic sedimentary rock)

Sandstone

Arenite (SiO2 based)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Ferruginous Sandstone (Ironstone)

Sandstone with Hematite/Goethite cement (SiO2 + FeO(OH))

Sandstone

Arenite (SiO2 primarily)

Polygenetic Conglomerate (Puddingstone)

Conglomerate (SiO2 matrix with mixed clasts)

Green Chalcedony (likely Green Agate or Chrysoprase)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Conglomerate

Conglomerate

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide staining)