Flint
Silicon dioxide (Microcrystalline quartz, SiO2)
sedimentary
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Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Porphyritic Basalt or Porphyritic Andesite Pebble
Extrusive Igneous Rock
igneous
Flint nodule
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Basalt Pebble
Mafic Extrusive Igneous Rock
igneous
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Flint
SiO2 (Microcrystalline Quartz)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
mineral
Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Carnelian
Chalcedony (SiO2)
gemstone
Belemnite Fossil
Belemnitida (rostrum)
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Flint / Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Basalt with Chert or Jasper Inclusion
Igneous basalt / sedimentary chert nodule
igneous
Flint Pebble
Silicon dioxide (microcrystalline quartz / chalcedony)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Flint / Chert Pebble
Microcrystalline quartz (SiO2)
sedimentary
Jasper and Basalt (Lake Superior Agate or Jasper Pebble)
Silicified rock / Cryptocrystalline quartz (SiO2) with basalt matrix
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Beach Pebble (Quartzite / Sandstone)
Quartz-rich sedimentary or metamorphic rock pebble
sedimentary
Flint
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Flint / Chert Nodule
Silica (Microcrystalline Quartz), SiO2
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz / Chert)
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Jasper
Silicon Dioxide (Microcrystalline Quartz / Chalcedony)
sedimentary
Flint / Chert (Beach-worn Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite
metamorphic
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Pebble
Quartzite (Metamorphosed Quartz Sandstone, SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary