Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
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Jasper
Silicon Dioxide (SiO2), Microcrystalline Quartz
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
mineral
Gold in Quartz
Gold (Au) in Quartz (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Mica schist
Schist (rich in Muscovite or Biotite mica)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Quartz (Pink / Ferruginous)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Mica Schist or Muscovite
KAl2(AlSi3O10)(OH)2
metamorphic
Quartz in Host Rock
Silicon Dioxide (SiO2)
mineral
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Fossilized Coral
Cnidaria (Hexacorallia)
fossil
Barite Rose
Barium Sulfate (BaSO4)
mineral
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Limonite
FeO(OH)·nH2O
mineral
Quartz Crystal in Matrix
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Sedimentary rock composed mainly of calcium carbonate (CaCO3)
sedimentary
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Peridotite
Ultramafic igneous rock (primarily olivine and pyroxene)
igneous
Mica / Muscovite or Biotite
Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Mica Schist with Pyrite and Quartz
Metamorphic Rock (Muscovite-Biotite Schist)
metamorphic
Ametrine
Quartz (Silicon Dioxide, SiO2)
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Vesicular and Amygdaloidal Basalt
igneous
Tiger's Eye (specifically Hawk's Eye or Multicolored Tiger's Iron)
Silicon Dioxide with Crocidolite inclusions (SiO2)
mineral
Green Aventurine
Quartz with fuchsite inclusions (SiO2)
mineral