Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Category
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Yellow Jade (or Carnelian / Chalcedony)
SiO2 (Silicon Dioxide)
mineral
Carnelian Agate / Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace impurities
mineral
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble (River Rock)
Metamorphic Quartzite (SiO2)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Ferruginous Sandstone
Sandstone (SiO2 with Fe2O3 cement)
sedimentary
Yellow Chalcedony / Yellow Agate
Silicon Dioxide (SiO2)
mineral
Banded Sandstone (River Pebble)
Clastic Sedimentary Rock (SiO2 with impurities)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst (Tumbled)
Silicon Dioxide (SiO2)
mineral
Banded Agate
Cryptocrystalline Silicon Dioxide (SiO2)
gemstone
Chert (with Limestone cortex)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartz (SiO2)
metamorphic
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Chert (or Chalcedony) Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert (Nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2) with host rock matrix
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
mineral
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (SiO2) with iron impurities
mineral
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary