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

Quartz (specifically Milky/Gray Quartz vein)

Silicon Dioxide (SiO2)

Chert (specifically Red Chert / Jasper nodule)

Silicon dioxide (SiO2)

Sandstone (Quartzite Pebble)

Arenite / Metamorphosed Sandstone (SiO2)

Sandstone (Water-worn Cobble)

Arenite (SiO2 based)

Sandstone (Quartzose Sandstone)

Arenite

Sandstone or Limestone

Sedimentary Rock

Chert (specifically Agate/Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Sandstone (Quartzose Sandstone Pebble)

Arenite (primarily SiO2)

Coquina / Fossiliferous Limestone

Calcite-rich Bioclastic Sedimentary Rock (CaCO3)

Sandstone (Muddy/Silty Variety)

Arenite with high silt/clay content (clastic sedimentary rock)

River Rock (River Cobbles)

Fluvial Conglomerate Clasts (primarily composed of various minerals such as Quartz, SiO2)

Chalk

CaCO3 (primarily Calcium Carbonate), biogenic sedimentary rock

Sandstone (Ferruginous)

Arenite (with Iron Oxides)

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Quartz (Druzy Quartz)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Ferruginous Sandstone (Gritstone)

Clastic sedimentary rock with iron-rich cement (FeO(OH)·nH2O)

Sandstone (likely Ferruginous)

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

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Chert (specifically Jasper/Brown Chert)

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Arenite (SiO2)

Green Jasper (Heliotrope / Bloodstone variety)

Silicon Dioxide (SiO₂)

River Cobble (Salt and Pepper Gneiss)

Gneiss (High-grade regional metamorphic rock)

Orange Calcite

Calcium Carbonate (CaCO3)

Sandstone

Arenite (composed primarily of SiO2)

Liesegang Banded Sandstone (Wonderstone)

Ferruginous Sandstone with Liesegang Rings

Granite

Plutonic felsic rock (Quartz, Feldspar, Mica)

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

Sandstone (likely Siltstone or Mudstone variety)

Clastic Sedimentary Rock (primarily SiO2 with iron oxides)

Sandstone Clast

Arenite (primarily SiO2)

Sandstone with Quartz Vein

Arenite with Quartz (SiO2) Infilling

Jasper Agate (specifically Brecciated Jasper)

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Ferruginous Sandstone

Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Coquina / Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate - CaCO3)

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Chert (specifically Flint or Dark Chalcedony)

Silicon Dioxide (SiO2)

Sandstone (likely Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone

Arenite (SiO2 primarily)

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)