Pumice
Pumice
igneous
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Quartz pebble
Silicon dioxide (SiO2)
mineral
Chert
Microcrystalline quartz (SiO2)
sedimentary
Yellow Sapphire
Corundum (Al2O3 with trace amounts of iron)
gemstone
Jasper and Quartz Breccia
Silicified breccia (SiO2)
sedimentary
Limestone with Fossil
Sedimentary limestone, calcium carbonate (CaCO3)
sedimentary
Tiger's Eye
SiO2 (Quartz pseudomorph after crocidolite)
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Basalt Pebble
Basalt
igneous
Green Jasper
Microcrystalline Quartz (SiO2) with inclusions
sedimentary
Fossil Coral and Quartz Pebble
Fossilized Anthozoa / Silicon Dioxide (Quartz)
sedimentary
Flint / Chert
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert
Silicon Dioxide (SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Basalt
Mafic extrusive igneous rock
igneous
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite
metamorphic
Galena
Lead Sulfide (PbS)
mineral
Chert
Microcrystalline quartz (SiO2)
sedimentary
Red Painted Rock
Artificial Coated Lithic Fragment
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Chert / Flint (Brecciated or Fossiliferous Limestone with Silicification)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Chert / Flint
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Quartz with Sericite and Cinnabar
Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)
mineral
Pegmatite
Igneous Pegmatite (Granitic Composition)
igneous
Crinoid Fossil Fragment
Crinoid stem fossil (Echinodermata)
fossil
Jasper
Silicon Dioxide (SiO2)
sedimentary
Rock Crystal Quartz Bead
Silicon Dioxide (SiO2)
mineral
Red Quartzite
Quartzite (Metamorphic quartz sandstone)
metamorphic
Sea Glass
Man-made vitreous material
mineral
Quartzite
Quartzite (Metamorphic rock composed primarily of quartz)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz pebble
SiO2
mineral
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous