Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Category
Man Made Glass
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Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz (Gray or Smoky variety)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Olivine/Peridot
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Orthoclase Feldspar (Granitic)
KAlSi3O8 (Potassium Feldspar)
igneous
Milky Quartz/Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Siltstone or Fine-grained)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Sandstone (likely with Quartz Veining)
Arenite (primarily SiO2)
sedimentary
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Olivine (Peridot)
Olivine (Magnesium Iron Silicate, (Mg,Fe)2SiO4)
mineral
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Quartz Cobble (River Stone)
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Sand Gravel
Silicon Dioxide (SiO2)
sedimentary