Quartzite
Quartzite (high SiO2 content)
metamorphic
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Quartzite pebble
Metamorphic rock (mainly SiO2)
metamorphic
Limestone
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Snowflake Obsidian
Volcanic glass containing Spherulite inclusions (primarily Cristobalite, SiO2)
igneous
Obsidian (Black Obsidian)
Amorphous volcanic glass (primarily SiO2)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Gray Quartzite River Rock
Meta-quartzite (SiO2)
metamorphic
Pebble (likely Siltstone or fine-grained Sandstone)
Sedimentary Clastic Rock
sedimentary
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Volcanic glass (SiO2-rich)
igneous
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Riverstone Quartzite
Quartzite (primarily SiO2)
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Quartzite Pebble
Quartzite (composed primarily of SiO2)
metamorphic
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Quartzite (River Pebble)
Quartzite, dominated by Silicon Dioxide (SiO2)
metamorphic
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Jasper and Agate Mix
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
White Quartz (Tumbled/Waterworn)
Silicon Dioxide (SiO2)
mineral
Citrine Quartz (Carved Point)
Silicon Dioxide (SiO2) with iron impurities
mineral
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Basalt
igneous
White Quartz
Silicon Dioxide (SiO2)
mineral
Blue Aventurine
Quartz (SiO2) with inclusions
mineral
Amethyst
Quartz (SiO2)
gemstone
Horn Coral Fossil
Rugose coral (Order Rugosa)
fossil
Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst Geode
Quartz (SiO2)
mineral
Petrified Coral Fossil (Honeycomb Coral)
Favosites (Rugosa/Tabulate coral fossil replaced by microcrystalline quartz/chalcedony)
fossil
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Aphanitic Mafic Igneous Rock
igneous
Tsavorite Garnet
Grossular Garnet, Ca3Al2(SiO4)3
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Black Onyx
Chalcedony (SiO2)
gemstone
Chalk
Sedimentary carbonate rock (Calcite, CaCO3)
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Aphanitic mafic extrusive igneous rock
igneous
White Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Quartz), SiO2
mineral