Antropogenic (Man Made Material)

Chert (Arrowhead Preform)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Milky Quartz

Silicon Dioxide (SiO2)

Chert (and Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Chert (Silicon Dioxide, SiO2)

Chert / Pink Flint

Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Micro-crystalline Quartz Pebble (Chert)

Silicon dioxide (SiO2)

Conglomerate with Fossilized Shark Teeth

Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains

Chert (Gravel)

Microcrystalline silica (SiO2)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (including Flint and Jasper variants)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or Jasper based on color)

Microcrystalline Silica (SiO2)

Nuummite

Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Granite

Granitic intrusive igneous rock

Diamond

Diamond (C)

Chert (includes Flint & Jasper)

Chert (Siliceous sedimentary rock, chemical formula SiO2)

Chert (Field Pebble)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Chert (specifically Blue Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Leopard Skin Jasper

Rhyolite (Silicon Dioxide with impurities), SiO2

Diamond (Princess Cut)

Carbon (C)

Chert (varietal Flint)

Silicon Dioxide (SiO2)

Glauconitic Sandstone (or Greensand)

Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Chert / Flint

Microcrystalline Silica (SiO2)

Chondrite Meteorite

Ordinary Chondrite (Fe-Ni alloy, Olivine, Pyroxene)

Tiffany Stone

Bertrandite Fluorite (CaF2 + Be4Si2O7(OH)2)

Basalt with Quartz/Feldspar Vein

Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)

Slate

Slate (Foliated Metamorphic Rock)

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Ferruginous Sandstone

Arenite with Iron-Oxide cement (Fe2O3 · nH2O)

Banded Calcite (often sold as 'Ocean Jasper' or 'Caribbean Calcite' variant)

Calcium Carbonate (CaCO3) with potential Aragonite inclusions

Chert (with Chalky Cortex)

Silicon Dioxide (SiO2)

Travertine (often colloquially called Tufa)

Chemical Sedimentary Calcium Carbonate (CaCO3)

Chert (Common Opal/Jasper variety)

Silicon Dioxide (SiO2)

Obsidian (in jewelry setting)

Volcanic Glass (Amorphous Silica)

Grey Chalcedony (Tumbled)

Chalcedony (SiO2)

Chert (varieties: Flint or Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (variously identified as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (CaCO3)

Chert (specifically Red Chert / Flint)

Silicon Dioxide (SiO2)

Chert (Flint Nobule)

Silicon Dioxide (SiO2)