Fossiliferous Limestone (or Bryozoan/Coral Fossil Pebble)
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Category
Anthropogenic Sedimentary (Man Made)
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Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartz Arenite)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (likely Arkosic or Ferruginous)
Arenite (SiO2 with iron oxides or feldspar)
sedimentary
Mixed collection of common river stones
Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material
igneous, sedimentary, metamorphic
Weathered quartz-rich stone, possibly chalcedony or calcite
Likely microcrystalline quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing
mineral
Limonite (Iron Stone Concretion)
Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O
mineral
Sandstone
Arenite
sedimentary
Mixed river gravel (alluvial conglomeratic sediment)
Polymictic alluvium; composition includes quartz, feldspar, chert, granite, basalt, and metamorphic rock fragments
sedimentary
Fossil Brachiopod or Mollusk Cast
Phylum Brachiopoda / Mollusca internal mold
fossil
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Variety: Agate / Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Conglomerate
Clast-supported polymict conglomerate
sedimentary
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Kambaba Jasper
Stromatolite / Fossilized Algae (Rhyolitic structure)
sedimentary
Chert
Microcrystalline silica (SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Sandstone (SiO2 predominant)
sedimentary
Weathered Sandstone with Algae Growth
Arenite
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2 with Hematite inclusions)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
sedimentary
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Chalcedony (SiO2) with iron inclusions
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Septarian Nodule (Dragon Stone)
Septarian Concretion (Calcite, Aragonite, and Limestone/Clay)
sedimentary
Banded Iron Formation (BIF) / Jaspilite
Banded Iron Formation (predominantly Hematite, Magnetite, and Quartz/Jasper)
sedimentary
Gastropod Fossil (Internal Mold)
Phylum Mollusca, Class Gastropoda (Steinkern)
sedimentary
Moqui Marble (Shaman Stone)
Ironstone Concretion (Fe2O3 - Hematite/Goethite shell with Sandstone core)
sedimentary
Fossiliferous Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary