Synthetic Polymer (Synthetic Material)

Petrified Wood

Silicified Wood (SiO2)

Quartz vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Lithic Matrix

Rough Diamond

Diamond (pure carbon, C)

Sandstone-based Concrete Fragment

Cementitious Composite with Sedimentary Aggregate

Chert (Jasper)

Microcrystalline Quartz (SiO2) with Iron Oxide inclusions

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Diamond

Diamond (C)

Slate

Slate (Foliated Metamorphic Rock)

Chert (Tan/Grey variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (often called Flint when dark)

Microcrystalline silicon dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Chert (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Jasper or Flint)

Cryptocrystalline Quartz (SiO2)

Chert (and Limestone) River Cobble

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Chert Pebble

Microcrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Coquina with Shell Fragment

Bioclastic Limestone (composed primarily of CaCO3)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

Blue Aragonite

Aragonite (Calcium Carbonate, CaCO3)

Banded Calcite (Mexican Onyx)

Calcite (CaCO3)

Chert (varietal: Jasper or Ironstone nodule)

Microcrystalline Quartz (SiO2) with iron oxides

Rough Diamond

Diamond (Native Carbon, C)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varieties: Flint or Chalcedony)

Microcrystalline silica (SiO2)

Limestone (Weathered Aggregate)

Sedimentary Carbonate Rock (CaCO3)

Chert (often referred to as Flint or Jasper when pigmented)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (variations include Flint/Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

Chert Breccia

Brecciated Chert (SiO2)

Chert (specifically Chalcedony or Flint variation)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (varieties include Jasper or Flint)

Chert (Microcrystalline Silica, formula: SiO2)

Chert (Jasper/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Chert (Pebble)

Microcrystalline silica (SiO2)

Chert (Chert / Flint Variety)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Chert (often called Flint)

Chert (Cryptocrystalline Silica, SiO2)

Quartzite Pebble

Quartzite (SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz-rich Sandstone (SiO2)