Chert / Flint
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Category
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Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Chert (Fossiliferous)
Silicon dioxide (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite (or Milky Quartz pebble)
Quartzite (Metamorphosed Sandstone) / Silicon Dioxide (SiO2)
metamorphic
Carnelian
Carnelian (microcrystalline variety of Quartz, SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide containing trace Iron impurities, SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Red Garnet (likely Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Yellow Quartzite
Quartzite (SiO2)
metamorphic
Clear Quartz (Tumbled)
Quartz (Silicon Dioxide - SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2
Mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Pearl
Calcium Carbonate (Aragonite and Calcite), CaCO3
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Tiger's Eye
Silica (Quartz) pseudomorph after Crocidolite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Carnelian
Carnelian (SiO2)
mineral
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Gold
Native Gold (Au)
mineral
Chert (Nodule)
Chert (primarily Microcrystalline Quartz - SiO2)
sedimentary
Amethyst (Rose de France)
Silicon Dioxide (SiO2) with iron impurities
mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide - SiO2)
mineral
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary