Chert (Yellow Jasper/Honey Chert)
Silicon Dioxide (SiO2)
sedimentary
Category
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Dyed Fuchsia Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Quartz (Milky/Clear Variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
River Stone (Quartzite/Basalt)
Variable; often Quartzite (SiO2) or Basaltic rock
metamorphic
Quartzite with Milky Quartz Vein
Metamorphosed Quartz-rich Rock (SiO2)
metamorphic
Chert
Chert (SiO2)
sedimentary
Fossiliferous Limestone with Quartz Veining
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Flint variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (Silicon dioxide, SiO2 based)
sedimentary
Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Quartz Geode fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Polished/Tumbled)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert with Chalcedony/Quartz Vug
Cryptocrystalline Silica (SiO2)
sedimentary
Chert (Flint)
Chert (Cryptocrystalline Silica/SiO2)
sedimentary
Multi-Gemstone Quartz Bracelet (Amethyst, Aventurine, Rose Quartz, Clear Quartz)
Silicon Dioxide (SiO2) mixture
gemstone
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (River Pebble)
Silicon Dioxide (SiO2)
mineral
Moqui Marble (Concretion)
Iron Oxide Concretion
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Chromite
Chromite (FeCr2O4)
mineral
Chert (Common Opal/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert Nodule (with Geode cavity)
Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper / Yellow Chalcedony Pebble
Silicon Dioxide (SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon dioxide (SiO2)
gemstone
Anthracite Coal
Anthracite (Metamorphic Coal)
sedimentary
Sandstone
Arenite (typically SiO2 based)
sedimentary
Blue Quartz (Dyed)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Chert (Flint)
Chert (Cryptocrystalline silicon dioxide, SiO2)
sedimentary
Clear Quartz with Limonite
Silicon Dioxide (SiO2) with Hydrated Iron Oxides
mineral