Mineral (Silicate Replaced Organic Material)

Chert (often called Flint)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Polished ocean jasper (likely orbicular jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and other silicates

Possible chert or weathered quartzite fragment

Microcrystalline quartz (SiO₂), identification uncertain from the photograph

Bivalve Fossil (Clam Stone)

Phylum Mollusca, Class Bivalvia

Petrified Wood

Petrified Wood (Silicified Wood)

Fossilized Shark Tooth

Carcharocles or Otodus sp. (Micro-fossilized)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified wood (Quartz variant, SiO2)

Petrified Wood (Silicified Wood)

Silicified Paleoflora (mainly Quartz, SiO2)

Chert (Septarian or Nodular variety)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Chert Nodules in Limestone

Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood with Lichen

Silicified Wood (SiO2) colonized by crustose lichens

Petrified Wood

Silicified Wood (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Polished rainbow jasper (likely ocean/imperial jasper)

Microcrystalline quartz (SiO₂) with iron oxides and varied silicate inclusions

Petrified Wood

Silicified Wood (SiO2)

Sandstone (Glauconitic)

Glauconitic Quartz Sandstone (SiO2 + (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Polished brown jasper or brecciated jasper

Microcrystalline quartz (SiO₂), commonly mixed with iron oxides and other silicates

Polished orbicular jasper (likely ocean jasper)

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron oxides and other silicate inclusions

Megalodon Shark Tooth

Otodus megalodon

Red Jasper

Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (Flint pebble)

Microcrystalline Quartz (SiO2)

Prehnite

Calcium aluminum silicate hydroxide - Ca2Al(AlSi3O10)(OH)2

Green Sandstone

Glauconitic Sandstone

Likely tumbled or polished fossil shell

Fossilized mollusk shell; exact species cannot be determined from this image