Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Category
None
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Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Chert (Jasper/Agate mix)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (C10H16O)
mineraloid
Iron-stained Quartz Vein
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geode
mineral
Colorless Quartz (Rhinestone)
Silicon Dioxide (SiO2)
mineral
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Red/Ferruginous)
Arenite (with iron oxide cement)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Chert with Quartz Vein
Silicon dioxide (SiO2)
sedimentary
Rough Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Quartzite with Hematite staining
Quartzite (SiO2)
metamorphic
Chert (often colloquially called Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone
Limestone (CaCO3 - Calcium Carbonate)
sedimentary
Tiger's Eye
Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2
metamorphic
Rainbow Hematite Ring
Iron(III) oxide (Fe2O3) with thin-film coating
mineral
Amethyst (as seen in jewelry)
Amethyst (Silicon Dioxide SiO2 + Fe4+)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milk Quartz (White Quartz)
Silicon Dioxide (SiO2)
mineral
Red Quartzite / Metasandstone River Pebble
Quartzite (primarily SiO2 with hematite inclusions)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Quartzite with inclusions
Quartzite
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Limonite (with Goethite/Hematite glaze)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Yellow Chert (River Stone)
Chert (SiO2)
sedimentary