Weathered quartz-rich rock, likely quartzite
Quartzite; predominantly crystalline SiO₂, possibly iron-oxide stained
metamorphic
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Weathered quartz-rich rock, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, possibly granitic gneiss
igneous
Biotite-rich granite or granitic gneiss
Granite; quartz–feldspar–biotite assemblage
igneous
Water-worn basalt cobble
Basalt; chiefly plagioclase feldspar, pyroxene, and minor olivine/iron oxides
igneous
Weathered granite or granitic gneiss
Granite; primarily quartz, feldspar, and mica (possibly metamorphosed to gneiss)
igneous
Fossiliferous limestone
Bioclastic carbonate rock, primarily calcite (CaCO₃)
sedimentary
Rounded quartz-rich beach pebble
Likely milky quartz or quartzite (SiO₂)
mineral
Dark basalt or basaltic volcanic rock
Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine
igneous
River Stone (likely Quartzite or Limestone)
Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)
metamorphic
Peridotite (Olivine Rock)
Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert Arrowhead (Flint Projectile Point)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite (Dioritic variant)
Granite (Phaneritic Igneous Rock)
igneous
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite or arkose)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite or arkose)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Weathered Pebble)
Sedimentary Rock (Quartz arenite)
sedimentary
Quartz Arenite / Sandstone
Quartz sandstone (SiO2 rich clastic sedimentary rock)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (SiO2 rich)
sedimentary
Sandstone
Arenite
sedimentary
Limestone (River Stone)
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Banded)
Arenite (primarily SiO2)
sedimentary
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Red Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Milky Quartz with Chlorite/Amphibite Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic