Cherry Quartz with Rose Quartz
Crystalline Quartz (SiO2) with glass-based synthetic components
gemstone
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Tiger's Eye
Pseudomorph of Quartz after Crocidolite
metamorphic
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Banded Agate
Silicon dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt River Pebble
Extrusive mafic igneous rock
igneous
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Dalmatian Stone
Dalmatian Stone (formerly called Dalmatian Jasper)
igneous
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian Arrowhead
Volcanic Glass (SiO2)
igneous
Chalcedony
Silicon Dioxide (SiO2)
mineral
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Amethyst Geode
Amethyst (Silicon Dioxide with Iron impurities, SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Chert (often called Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chert (specifically Cryptocrystalline Quartz)
Silicon dioxide (SiO2)
sedimentary
Druzy Quartz Geode (with Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Quartzite and Quartz Pebbles
Tectosilicate - Silicon Dioxide (SiO2)
metamorphic
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (varieties: Flint or Jasper)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Red Jasper with Quartz
Opaque microcrystalline Quartz (SiO2) with Hematite inclusions
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (Lithic Wacke)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary