Granite
Felsic intrusive igneous rock
igneous
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Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Lapis Lazuli
Rock composed mainly of lazurite ((Na,Ca)8(AlSiO4)6(SO4,S,Cl)2), calcite, and pyrite
metamorphic
Yellow Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Granite
Intrusive Igneous Rock
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Lepidolite
K(Li,Al)3(Al,Si,3O10)(F,OH)2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Dyed Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Iron Meteorite
Iron-Nickel Alloy (Kamacite and Taenite)
meteorite
Obsidian
Volcanic glass (Amorphous silicon dioxide)
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Silicon dioxide with crocidolite inclusions (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Bloodstone
Chalcedony variety Heliotrope (SiO2 with inclusions)
mineral
Serpentinite
Serpentinite (Hydrated magnesium iron silicate)
metamorphic
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Limonite
FeO(OH)·nH2O
mineral
Tourmaline
Schorl (Complex boron silicate, NaFe3Al6(Si6O18)(BO3)3(OH)4)
mineral
Smoky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Red Calcite
Calcium Carbonate (CaCO3)
mineral
Red Sandstone
Quartzose Sandstone (primarily quartz grains cemented by iron oxides)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (CaCO3)
sedimentary
Shark Tooth Fossil
Chondrichthyes fossil
fossil
Chert
Microcrystalline quartz (SiO2)
sedimentary
Fossil Coral
Phylum Cnidaria / Rugosa or Tabulata
fossil
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Prehnite
Calcium aluminum silicate hydroxide, Ca2Al(AlSi3O10)(OH)2
mineral
Granite
Intrusive Igneous Rock
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Serpentine
(Mg,Fe)3Si2O5(OH)4
metamorphic