Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
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Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
Fossiliferous Chert (Brachiopod/Bryozoan Fossil)
Microcrystalline quartz (SiO2) with fossil inclusions
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Lake Superior Agate
Silicon Dioxide (Chalcedony variety)
gemstone
Hematite
Iron(III) oxide (Fe2O3)
mineral
Amethyst
Quartz (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Quartzite Pebble
Metamorphic Quartz Sandstone (SiO2)
metamorphic
Flint
Microcrystalline Quartz (SiO2)
sedimentary
Kimberlite
Ultramafic igneous rock
igneous
Fossil Snail Shell (Embedded in Resin)
Gastropoda fossil
fossil
Lepidolite
K(Li,Al)3(Al,Si,3O10)(F,OH)2
mineral
Tiger's Eye
Silicon Dioxide with Crocidolite inclusions (SiO2)
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions (SiO2)
igneous
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Ruby in Zoisite
Anyolite
metamorphic
Hematite
Hematite (Fe2O3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Extrusive Igneous Rock
igneous
Larvikite
Monzonite (anorthoclase-bearing)
igneous
Flint / Chert
Silicon Dioxide (SiO2)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz / Chert)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper and Quartz Pebble
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Agate
Silicon Dioxide (Quartz), SiO2
mineral
Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Flint
Microcrystalline quartz (SiO2)
sedimentary
Pink Feldspar
Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8
mineral