Milky Quartz
Silicon Dioxide (SiO2)
mineral
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Quartzite
Metamorphic rock primarily composed of Quartz (SiO2)
metamorphic
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO₂)
mineral
Bloodstone
Heliotrope (Chalcedony)
mineral
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Agate (Gray/Brown)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) - variety Jasper
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (and Limestone)
Chert (consisting of Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chalcedony in Host Rock
Silicon Dioxide (SiO2)
mineral
Graywacke with Quartz Veins
Argillaceous Sandstone (Graywacke)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (often called Flint or Jasper when red)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amethyst Geode
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon dioxide (variant with ferric iron impurities), SiO2
mineral
Orange Moss Agate / Carnelian Agate
Silicon dioxide (SiO2) - variety Chalcedony
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Quartzite
Quartzite (SiO2)
metamorphic
Yellow Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Quartzite (Pebble)
Quartzite
metamorphic
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral