Organic (Mineraloid)

Petrified Wood

Silicified Wood (SiO2)

Chert (specifically Chert Nodule/Flint)

Chert (Silicon Dioxide, SiO2)

Limestone (Concretionary or Tufa)

Calcium Carbonate (CaCO3)

Chert (specifically Yellow/Brown Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Chert Pebble (Jasper variety)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (primarily composed of SiO2)

Chert (variant Flint)

Silicon Dioxide (SiO2)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Silica (SiO2)

Quartz Geode in Chert/Limestone Matrix

Silicon Dioxide (SiO2) within Sedimentary Host Rock

Picture Jasper

Silicon Dioxide (SiO2) - Opaque Chert/Quartzite variety

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

Banded Chert

Microcrystalline silicon dioxide (SiO2)

Chert / River Pebble

Microcrystalline Silica (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cement)

Petrified Wood

Silicified Wood (SiO2)

Chert (with Calcite Veining)

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) veins

Jasper

Silicon Dioxide (SiO2)

Zebra Marble

Metamorphosed Alabaster/Limestone (CaCO3)

Jasper (Brown Iron-Rich Variety)

Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)

Banded Chert

Cryptocrystalline Quartz (SiO2)

Red Jasper

Microcrystalline Quartz (SiO2) with Hematite impurities

Chert (Flint)

Silicon Dioxide (SiO2)

Banded Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Chert / Flint

Cryptocrystalline Quartz (Silicon Dioxide, SiO2)

Chert (Nodule / Geode fragment)

Microcrystalline Quartz (SiO2)

Chert / Pink Flint

Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified wood (principally Silicon Dioxide, SiO2)

Chert (specifically Chalcedony/Flint variant)

Silicon Dioxide (SiO2)

Chert (specifically Green Chert/Jasper)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Petrified Wood

Silicified Wood (SiO2)

Chert (Iron-stained)

Chert (primarily Microcrystalline Quartz, SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (with Quartz Veining)

Chert (formula: SiO2)

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Chert / Quartz Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Jasper/Flint variety)

Microcrystalline silicon dioxide (SiO2)

Chert (Quartz Pebble)

Silicon Dioxide (SiO2)

Chert (with Liesegang Banding)

Microcrystalline quartz (SiO2)

Chert (variously known as Flint or Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Petrified Wood

Silicified Wood (SiO2)

Chert (Red/Pink Jasper subtype)

Silicon Dioxide (SiO2)