Quartz
Silicon Dioxide (SiO2)
mineral
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Basalt Pebble
Aphanitic Igneous Rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Muscovite Schist
Metamorphic rock primarily composed of quartz and muscovite mica
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Raw Quartz
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Granitic Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Soapstone Carving
Steatite
metamorphic
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Galena
Lead Sulfide (PbS)
mineral
Porphyritic Igneous Rock / Rhyolite Porphyry
Porphyritic volcanic rock
igneous
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Jasper and Agate Mix
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Moqui Marble
Hematite-Goethite Concretion (Fe2O3 / FeO(OH))
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Mineral Amygdules
igneous
River Rock
Silica-rich water-worn rock / Quartzite
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (Metamorphic rock primarily composed of SiO2)
metamorphic
Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic