Red Sandstone
Sandstone (principally Quartz, SiO2, with Iron Oxide hematite cement)
sedimentary
Category
Man Made Rock (Technosol)
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Chalcedony / Quartz Nodule (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (Quartz variety, SiO2)
mineral
Banded Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2)
sedimentary
Tumbled Agate Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartzite (River Cobble)
Metamorphic Quartzite (SiO2)
metamorphic
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
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
Puddingstone (Polished Pebble)
Conglomerate (Quartz-rich)
sedimentary
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 / Feldspar Veined Metamorphic Pebble
Metamorphic Rock with K-Feldspar, Epidote, and Quartz
metamorphic
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
Crystalline Silica (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)
sedimentary
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Pebble
Lithified rock fragment / Sedimentary clast
sedimentary
Fossilized Coral
Rugose Coral / Hexagonaria (Fossilized calcium carbonate)
fossil
River Pebble
Weathered Rock Fragment
sedimentary
Basalt
Extrusive igneous rock
igneous
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Fossil Coral
Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Calcareous or Quartz-rich)
Arenite
sedimentary
Shale
Sedimentary Shale
sedimentary
Shale and Pebble Fragment
Sedimentary Rock (Mudstone/Shale with Silica Pebble)
sedimentary
Mudstone
Argillite / Siliciclastic sedimentary rock
sedimentary
River Rock (likely Basalt or Greywacke)
Basalt or Lithic Sandstone
Igneous or Sedimentary (water-worn)
Basalt with Calcite Veins
Extrusive Igneous Rock
igneous
Crushed Stone / Gravel
Aggregate (mixed lithology)
sedimentary
Basalt
Aphanitic Mafic Igneous Rock
igneous
Basalt (with possible quartz/calcite inclusion)
Extrusive mafic igneous rock
igneous
Basalt with Plagioclase or Quartz Inclusion
Melanocratic Basalt with Porphyritic Inclusion
igneous