Red Jasper
Quartz (SiO2) with hematite inclusions
sedimentary
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Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Dyed Howlite (Purple)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Chert (Beach Pebble)
Silicon Dioxide (SiO2)
sedimentary
Native Gold
Native Gold (Au)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Dyed Tumbled Quartz
Silicon Dioxide (SiO2) with artificial pigment
mineral
Moqui Marble
Iron-oxide concretion (typically Goethite or Hematite)
sedimentary
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint/Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Smoky/Milky Variety)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
gemstone
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodule in Limestone
Microcrystalline Silica (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Chert Concretion
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Botiroidal Chalcedony or Silicified Fossil Coral
Silicon Dioxide (SiO2) - Chalcedony / Scleractinia (if fossilized)
sedimentary
Amethyst
Quartz (SiO2)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Beach Pebble (Quartz / Quartzite)
Silicon Dioxide (SiO2)
sedimentary
Dyed Agate / Ruby Quartz
SiO2 (Silicon Dioxide)
gemstone
Limonite (Yellow Ochre)
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2
mineral
Quartz Pebble (on Granite)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Basalt (with possible quartz/calcite inclusion)
Extrusive mafic igneous rock
igneous
Basalt River Cobble
Basalt (Aphanitic extrusive mafic igneous rock)
igneous
Carnelian Agate
Chalcedony (SiO2 with Iron Oxides)
sedimentary
Basalt Pebble
Basalt
igneous
Quartzite pebble
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Common Opal/Quartz mix)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Hag Stone
Perforated Flint or Chert (SiO2)
sedimentary