Petrified Wood
Silicified wood (primarily quartz, SiO2)
Category
Browse sedimentary rock (cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Petrified Wood
Silicified wood (primarily quartz, SiO2)
Chert (Honey Chert or Chalcedony Pebble)
Cryptocrystalline Quartz (SiO2)
Chert / Pink Flint
Cryptocrystalline Quartz (SiO2)
Chert / Flint
Cryptocrystalline quartz (SiO2)
Chert
Microcrystalline Quartz (SiO2)
Chert Arrowhead
Microcrystalline Quartz (SiO2)
Chert (specifically Gray Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert Arrowhead (Lithic Artifact)
Chert (Cryptocrystalline Quartz, SiO2)
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
Chert (Pebble)
Silicon Dioxide (SiO2)
River Pebble (likely Quartzite or Chert)
Sedimentary Clast (Silicon Dioxide dominant)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Mixed River Pebbles and Jasper
Siliciclastic sediment and microcrystalline quartz
Green Jasper
Microcrystalline Quartz (SiO2)
Waterworn Pebble / Quartzite
Metamorphic/Sedimentary rock fragment
Chert Arrowhead (Jasper)
Microcrystalline Quartz (SiO2)
Chert
Microcrystalline Quartz (SiO2)
Chert (Nodular or Massive Variety)
Cryptocrystalline Quartz (SiO2)
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Jasper
Microcrystalline Quartz (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Jasper (specifically Bloodstone/Heliotrope or Dark Green Jasper)
Cryptocrystalline Quartz (SiO2) with inclusions
Chert (Field Stone/Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
Chert (Likely Jasper)
Microcrystalline Quartz (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Chert (Nodule)
Microcrystalline Quartz (SiO2)
Jasper
Microcrystalline Quartz (SiO2)
Banded Agate
Cryptocrystalline Silicon Dioxide (SiO2)
Carnelian
Carnelian (Silicon Dioxide - SiO2)
Agate
Silicon Dioxide (SiO2) - variety Chalcedony
Chert (often called Flint in dark varieties)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Milky chalcedony cabochon ring
Chalcedony, microcrystalline quartz (SiO₂), likely white or pale agate variety
Chert (or Flint)
Chert (cryptocrystalline quartz), SiO2
Chert (Flint)
Microcrystalline Quartz (SiO2)
Agated Chert
Microcrystalline Quartz (SiO2)
Banded Agate (Carnelian-Agate)
Silicon Dioxide (SiO2)
Banded Sedimentary Rock
Sedimentary rock with mineral veins/banding
Chert
Chert (variant of microcrystalline quartz)
Chert (Common Jasper/Flint)
Microcrystalline Quartz (SiO2)
Chert (specifically Flint or Jasper variant)
Microcrystalline quartz (SiO2)
Jasper and Agate Mix
Silicon dioxide (SiO2) - Microcrystalline Quartz