River Quartzite (River Rock)
Quartzite (SiO2)
metamorphic
Category
Not A Rock (Synthetic Material)
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Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 predominant)
sedimentary
Quartz River Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Bicolor Quartz Pebble
Silicon Dioxide (SiO2) with mineral inclusions
mineral
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite or arkose)
sedimentary
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Granite
Phaneritic plutonic rock (Quartz + Feldspar + Mica)
igneous
Breccia Pebble
Sedimentary Breccia
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Bauxite / Iron-rich Laterite
Laterite (principally Al(OH)3, Fe2O3, and SiO2)
sedimentary
Granite / Diorite (Granitoid)
Granitoid rock (composed mainly of Quartz, Feldspar, and Amphibole/Biotite)
igneous
Sandstone Pebbles
Arenite (primarily SiO2 with mineral cement)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Travertine (or Calcareous Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Banded Serpentinite (Beach Pebble)
Serpentine-group silicate rock ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe,Al)2O5(OH)4)
metamorphic
Quartz-veined Greywacke
Silicon dioxide (SiO2) in Lithic Sandstone
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Slag (Industrial Byproduct)
Anthropogenic Vitreous Silicate material
igneous
Granite
Intrusive igneous rock
igneous
Weathered granite pebble
Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust
igneous
Granite River Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone (Ferruginous / River-worn Cobble)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Biotite schist (likely graphite-bearing)
Mica schist; chiefly quartz + biotite mica, with possible graphite and feldspar
metamorphic
Sandstone
Arenite
sedimentary
Chert (Common Opal variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (River Cobble)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Flowerstone
Porphyritic Basalt or Porphyritic Andesite
igneous
Chondrite Meteorite
Ordinary Chondrite (Undifferentiated Stony Meteorite)
meteorite
Chakra Stone Bracelet
Mixed Mineral Assembly (Scoria, Amethyst, Lapis Lazuli, Turquoise/Howlite, Impression Jasper, Tiger's Eye, Carnelian, Red Jasper)
igneous, metamorphic, and sedimentary
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, Limestone)
sedimentary
Red Quartzite Pebble
Quartzite (SiO2)
metamorphic
Rounded brown-gray stone, possibly weathered conglomerate or sandstone
Indeterminate clastic sedimentary rock; likely poorly cemented sandstone/conglomerate
sedimentary