Quartz (Rose or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
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Red Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
gemstone
Quartz (Yellow/Citrine variety or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Heart-shaped Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Petrified Wood
Silicified wood (primarily quartz replacing organic cellulose)
fossil
Chert
Silicon dioxide (SiO2)
sedimentary
Basalt Pebble
Extrusive Igneous Rock (Mafic)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Labradorite
Plagioclase Feldspar ((Na,Ca)(Al,Si)4O8)
mineral
Olivine (Peridot)
(Mg,Fe)2SiO4
mineral
Basalt with Calcite Veins
Extrusive Igneous Rock
igneous
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Quartz Vein Quartzite Pebble
Quartzite with Quartz Veining
metamorphic
Red Siltstone
Siltstone
sedimentary
Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Amethyst
Quartz (SiO2)
mineral
Amethyst Cluster
Quartz (Silicon Dioxide, SiO2)
gemstone
Granite
Felsic intrusive igneous rock
igneous
Quartz (Citrine / Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Water-worn Pebbles)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Yellow/Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Agate
Chalcedony (SiO2)
gemstone
Limestone with Stylolites
Calcareous sedimentary rock (CaCO3)
sedimentary
Obsidian
Volcanic Glass
igneous
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Gabbro
Plagioclase-pyroxene intrusive igneous rock
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary