Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
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Basalt
Mafic extrusive igneous rock
igneous
Jasper and Chalcedony Composite
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Coral
Rugose coral / Tabulate coral (Calcium carbonate, CaCO3)
fossil
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Banded Jasper and Quartz Pebble
Silicified sedimentary rock / Chalcedony (SiO2)
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Mixed Gravel and Pebbles
Polylithic Alluvial Aggregate
igneous, sedimentary, and metamorphic mix
Quartz (Smoky Quartz with inclusions)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Coral
Hexagonaria (Rugose and Tabulate coral fossils)
fossil
Green Gneiss
Metamorphic Gneiss
metamorphic
Limestone
Sedimentary Rock (Primarily Calcium Carbonate, CaCO3)
sedimentary
Mica Schist
Metamorphic Rock (rich in Muscovite or Biotite mica)
metamorphic
Granite
Intrusive Igneous Rock
igneous
White Quartz
Silicon Dioxide (SiO2)
mineral
Veined Sandstone with Calcite Veins
Sedimentary sandstone with hydrothermal/mineral veins
sedimentary
Quartz-veined Sandstone Pebble
Quartzose Sandstone with Quartz Veinlets
sedimentary
Basalt with Iron Oxidation
Extrusive Igneous Rock (Mafic)
igneous
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Unakit
Epidotized Granite
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Unakite
Altered granite (Epidote, Orthoclase Feldspar, and Quartz)
metamorphic
Bloodstone
Chalcedony (Variety: Bloodstone / Heliotrope), SiO2
mineral
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Larimar
Pectolite (NaCa2Si3O8(OH))
gemstone
Moss Agate
Silicon Dioxide (Chalcedony variety) with green hornblende or chlorite inclusions - SiO2
gemstone
Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Blue Agate (Dyed)
Silicon Dioxide (Chalcedony), SiO2
gemstone
Dragon Vein Agate (Dyed/Fractured Quartz)
Silicon dioxide (SiO2)
gemstone
Dyed Tumbled Quartz (Dragon's Vein Agate/Quartz)
Silicon Dioxide (SiO2) with artificial dye
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Chrysocolla
Cu2-xAlx(H2O)n(H2Si2O5)5 · nH2O (Hydrated copper aluminum silicate)
mineral
Green Tourmaline
Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH))
mineral
Blue Agate (Dyed or Treated Chalcedony)
Silicon Dioxide (SiO2), microcrystalline quartz variety
mineral
Gabbro
Gabbro
igneous