Man Made Material (Constructed)

Pyrite

Iron Sulfide (FeS2)

Tiger Iron

Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chalcedony (specifically Blue Chalcedony or Common Opal variety)

Silicon Dioxide (SiO₂)

Jasper

Silicon dioxide (SiO2)

Stromatolite

Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)

White Jade (Nephrite)

Nephrite, Ca2(Mg,Fe)5Si8O22(OH)2

Sedimentary Breccia

Clastic Breccia (CaCO3/SiO2 matrix)

Chert (varietal Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variations include Flint or Jasper)

Silicon Dioxide (SiO2)

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate - CaCO3)

Uraninite (Pitchblende)

Uranium dioxide (UO2)

Chert (Chalcedony/Flint)

Silicon Dioxide (SiO2)

Chert (Pink Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Field Stone)

Chert (Silicon Dioxide, SiO2)

Ferruginous Conglomerate

Conglomerate with Iron-Oxide Matrix (SiO2 + Fe2O3/FeO(OH))

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (often called Flint in various colors)

Silicon Dioxide (SiO2)

Flint (Chert)

Cryptocrystalline Quartz (SiO2)

Ferruginous Sandstone (Gozzan)

Iron-rich clastic sedimentary rock with Limonite/Goethite

Diamond

Diamond (C)

Flint

Chert (Silicon dioxide, SiO2)

Limonite-stained Chert

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)

Ferruginous Sandstone (Ironstone)

Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)

Banded Calcite (often sold as 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Chert (Banded Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Slate

Metamorphosed Shale (Fine-grained Foliated Metamorphic Rock)

Diamond

Carbon (C)

Coquina

Bioclastic Limestone (composed primarily of Calcium Carbonate / CaCO3)

Chert (often called Flint or Jasper when pigmented)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Green Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (and Flint)

Microcrystalline Quartz (SiO2)

Banded Calcite (often sold as Onyx or Mexican Onyx)

Calcite (Calcium Carbonate, CaCO3)

Red Jasper

Jasper (Silica/Microcrystalline Quartz with Hematite inclusions), SiO2

Nuummite

Nuummite (intergrowth of orthoamphiboles Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)

Petrified Wood

Silicified Wood (primarily SiO2)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)

Limestone

Calcium Carbonate (CaCO3)