Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
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Flint / Chert (Hag Stone)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Quartzite with Quartz Veins
Metamorphic Quartzite (SiO2)
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Amber
Fossilized tree resin (C10H16O)
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Brecciated Quartz
Silicon Dioxide (SiO2) with iron oxide cement
sedimentary
Flint / Chert
Silicon dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Basalt Pebble
Extrusive Igneous Rock
igneous
Fossiliferous Flint or Chert with Bryozoan Fossils
Sedimentary cryptocrystalline quartz (SiO2) with fossil inclusions
sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-veined Metamorphic Pebble
Silicate-rich metamorphic rock with quartz veins (SiO2)
metamorphic
Fossiliferous Limestone
Biogenic Sedimentary Rock (primarily CaCO3)
sedimentary
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Quartz Vein in Basalt or Porphyry
Silicate-veined volcanic rock
igneous
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Flint with Fossil
Silicon dioxide (SiO2) microcrystalline quartz with fossiliferous inclusions
sedimentary
Basalt Pebble
Extrusive igneous rock
igneous
Basalt Pebble
Basalt
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz (Agate/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Eyestone Flint
SiO2 (Microcrystalline Quartz / Flint)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
Red Sandstone Pebble
Sedimentary quartz sandstone
sedimentary
Flint Pebble
SiO2 (Microcrystalline Quartz / Chalcedony)
sedimentary
Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
Quartz (Peach/Pink Variety)
Silicon Dioxide (SiO2)
mineral
Hag Stone
Perforated sedimentary rock (typically limestone, sandstone, or flint)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz / Chert)
sedimentary
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz-veined Sandstone Pebble
Quartzite-veined Arenite
sedimentary
Vein-filled Porphyry or Brecciated Jasper Pebble
Brecciated volcanic rock with quartz/calcite veins
igneous
Belemnite Fossil
Belemnitella sp. (rostrum)
fossil