Quartzite (River Cobble)
Metamorphic Quartzite (SiO2)
metamorphic
Category
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Chalcedony (Yellow Agate / Carnelian Chalcedony)
Silicon Dioxide (SiO2)
mineral
River Pebble (Sandstone)
Quartz-rich Sandstone Pebble
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Granite / Feldspar gravel
Granite (felsic intrusive igneous rock)
igneous
Yellow Quartz / Chalcedony Pebble
Silicon Dioxide (SiO2)
mineral
Gray Pebble (Graywacke / Basalt)
Graywacke (or fine-grained Basalt)
sedimentary
Jasper
Silicon Dioxide (Quartz variety, SiO2)
mineral
Chalcedony / Quartz Nodule (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Sandstone (principally Quartz, SiO2, with Iron Oxide hematite cement)
sedimentary
Puddingstone (Polished Pebble)
Conglomerate (Quartz-rich)
sedimentary
Unakite / Feldspar Veined Metamorphic Pebble
Metamorphic Rock with K-Feldspar, Epidote, and Quartz
metamorphic
Quartzite Cobble (Iron-stained)
Quartzite (SiO2)
metamorphic
Yellow Jasper (Chert) Pebble
Silicon Dioxide (SiO2) with Iron Oxides
sedimentary
Red Sandstone
Sandstone (hematitic/iron-rich quartzite or arenite)
sedimentary
Unakite / Red Jasper beach pebble
Altered Granite (Epidotized Feldspar and Quartz)
metamorphic
Sandstone (with Chert/Quartzite nodules)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Mixed River Stones and Minerals
Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)
sedimentary
Jasper River Stone
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Thunderegg (Ate Agate/Jasper Geode)
Silicon Dioxide (SiO2) within Rhyolite/Perlite matrix
sedimentary/igneous intermediary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Crystalline Silica (SiO2)
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)
sedimentary
River Stone (Basalt)
Extrusive Igneous Rock (Mafic)
igneous
Basalt (River Rock)
Basalt
igneous
Vesicular Basalt (Amygdaloidal Basalt)
Basalt with Secondary Mineral Inclusions
igneous
Vesicular Basalt (Scoria)
Mafic Igneous Volcanic Rock
igneous
Basalt River Stone
Basalt (Mafic volcanic rock)
igneous
Basalt Pebble
Basalt
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt River Pebble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Basalt with minor mineral crusting
Sideromelane / Extrusive Igneous Rock
igneous
Basalt (Beach Pebble)
Basalt
igneous
Basalt
Basalt (extrusive volcanic rock)
igneous
Basalt (with possible fine-grained mineralization)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Vesicular Basalt (or Scoria)
Basalt (Aphanitic-Vesicular Mafic Igneous Rock)
igneous
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Pebble
Lithified rock fragment / Sedimentary clast
sedimentary
River Pebble
Weathered Rock Fragment
sedimentary
Basalt
Extrusive igneous rock
igneous
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic