Quartz Pebble (Chalcedony / Agate)
Silicon Dioxide (SiO2)
sedimentary
Category
Synthetic (Not A Natural Rock)
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Sandstone (with Calcite or Silica veins)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Basalt River Stone
Basalt (extrusive igneous rock)
igneous
Granite
Phaneritic plutonic rock (composed of quartz, feldspar, and mica)
igneous
Shale (or Mudstone)
Clay mineral aggregate / Fine-grained siliciclastic sedimentary rock
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Siltstone or Limestone Beach Pebble
Siltstone / Micritic Limestone
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 predominant)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
River Cobble (likely Metasedimentary)
Metasedimentary Rock / Quartz-rich Sandstone
metamorphic
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)
sedimentary
Black obsidian (probable)
Volcanic glass; primarily SiO₂-rich rhyolitic composition
igneous
Tumbled Mixed Gemstones and Rocks
Various mineral species including quartz (SiO2) and silicate minerals
mineral
Ironstone / Hematite Concretion
Iron oxide / Fe2O3
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Ferruginous Sandstone Pebble
Iron-rich Clastic Sedimentary Rock
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Hag Stone
Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Chert (Green Fossilized Algae or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert Nodule / Ironstone Concretion
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Smoky Quartz (with possible Garnet inclusions)
Silicon Dioxide (SiO2)
mineral
Granite Pebble (Pink Feldspar-rich)
Granite
igneous
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral