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

Sandstone

Arenite (SiO2 predominantly)

Basalt River Stone

Basalt (Mafic volcanic rock, primarily Plagioclase and Pyroxene)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)

Sandstone (lithic/greywacke variant)

Clastic sedimentary rock (primarily SiO2 with rock fragments)

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Shale

Argillaceous Rock

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Sandstone

Arenite (Sedimentary Rock)

Sandstone (with carbonaceous plant fragments)

Arenite (composed primarily of SiO2)

Chert

Silicon dioxide (SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

Sandstone (Quartz-rich)

Arenite (SiO2)

Conglomerate

Conglomerate (a clastic sedimentary rock)

Conglomerate

Conglomerate (Detrital Sedimentary Rock)

Bumblebee Jasper

Volcanic Tuff (mixture of Quartz, Sulfur, Hematite, and Orpiment)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Chert (Jasper)

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Chert (often called Jasper or River Siltstone)

Microcrystalline Quartz (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Puddingstone (Gowganda Tillite/Jasper Conglomerate)

Jasper Conglomerate (SiO2 primary composition)

Jasper (Yellow Jasper)

Silicon Dioxide (SiO2) with iron inclusions

Sedimentary rock with quartz veining

Laminated siltstone or mudstone with hydrothermal quartz veins

Chert

Silicon dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (with Iron concretions/staining)

Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)

Shale (with Iron Oxide staining)

Fissile Mudstone (primarily Quartz and Clay minerals)

Limonite stained Sandstone

Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Conglomerate (or Breccia)

Clastic Sedimentary Rock (Conglomeratic)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Siltstone or Mudstone

Argillaceous sedimentary rock

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate

Conglomerate (Sedimentary rock)

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix