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

Sandstone

Arenite (primarily SiO2)

River Pebble (Gravel)

Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)

Quartz Vein in Siltstone

SiO2 (Quartz) on clastic sedimentary matrix

Sandstone

Arenite (composed primarily of SiO2)

Ferruginous Sandstone

Clastic Sedimentary Rock (Iron-rich)

Sandstone with Secondary Mineral Encrustation

Arenite with Silica/Calcite deposits (SiO2 or CaCO3)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz - SiO2)

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

Chert (River Cobble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Sandstone (with potential trace fossils)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Yellow Quartzite River Cobble

Meta-quartzite (SiO2 with iron oxide staining)

Dragon Stone

Argillaceous Sedimentary Rock (Ohko Stone)

Sandstone Pebbles

Arenite (Sedimentary rock composed of sand-sized grains)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (likely Calcareous or Quartz-rich)

Arenite (SiO2 based typically)

Sandstone

Arenite (composed primarily of SiO2)

Quartz Geode (River Cobble)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Agate (Carnelian / Chalcedony)

Silicon Dioxide (SiO2)

Petoskey Stone

Hexagonaria percarinata

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone (with banding/weathering)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (likely Iron-rich or Arkosic)

Arenite (SiO2 with FeO(OH) or Fe2O3 staining)

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz, SiO2)

Shale

Fissile Mudstone (Shale)

Chert (Jasper variety)

Cryptocrystalline quartz (SiO2)

Sandstone (Quartz Arenite)

Clastic Sedimentary Rock - Quartz Arenite

Sandstone Pebble

Arenite (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Weathered Pebble)

Arenite (composed primarily of SiO2)

Sandstone (Red/Brown Variety)

Arenite (SiO2 with iron oxide impurities)

Sandstone

Arenite (often composed of Quartz, SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Red Jasper

Jasper (Silica with Hematite impurities), SiO2

Sandstone

Arenite/Quartz Arenite

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Sandstone (likely Red/Brown Sandstone)

Arenite (SiO2 based)