Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
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Chert (Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Oolitic Chert
Ooidal Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Sandstone
Arenite
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Rose Quartz
Rose Quartz (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Native Gold
Native Gold (Au)
mineral
Quartzite Pebble
Metamorphosed Sandstone (SiO2)
metamorphic
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Carnelian (Red Agate)
Silicon dioxide (SiO2) with iron oxide impurities
mineral
Quartz / Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Weathered Cobble)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Chert (Gravel Fragment)
Silicon dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
River Pebble (Greywacke or Basaltic)
Massive Greywacke or Basaltic Andesite
sedimentary or igneous
Basalt Pebble
Extrusive mafic igneous rock
igneous
Citrine
Silicon dioxide (SiO2)
mineral
Carnelian Agate
Chalcedony (SiO2 with iron oxide impurities)
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Basalt
Extrusive mafic igneous rock
igneous
Amethyst
SiO2 (Silicon Dioxide with iron impurities and irradiation)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (containing fossil leaf impression)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Chert (Red Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Sugar variety)
Silicon Dioxide (SiO2)
mineral
Chert (often colloquially referred to as Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Chert Nodule with Cortex)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Arkose)
Arkose Sandstone (principally SiO2 with Feldspar)
sedimentary
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartzite
Quartzite (SiO2)
metamorphic