Limestone

Chert / Jasper

Microcrystalline Quartz (SiO2)

Chert (specifically a Chert Nodule or Flint)

Cryptocrystalline Quartz (SiO2)

Chert (Blue-Gray Chert)

Microcrystalline quartz (SiO2)

Nephrite Jade

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

Epidote

Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Nephrite Jade

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

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Nephrite Jade

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

Nephrite Jade

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

Black Limestone with Calcite Veining

Bituminous Limestone (CaCO3 with Organic Carbon inclusions)

Limestone with Weathering Rind

Calcium Carbonate (CaCO3) - Bioclastic or Micritic Limestone

Chert (Flint variety)

Silicon Dioxide (SiO2)

Chert (often called Flint)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Chert (Honey Chert / Flint)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Arrowhead Preform or Flake)

Microcrystalline Quartz (SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodular Chert)

Microcrystalline Silica (SiO2)

Chert (Flint variety)

Silicon Dioxide (SiO2)

Druzy Quartz (on Quartzite or Chert)

Silicon Dioxide (SiO2)

Chert (Yellow or Ochre Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (specifically Jasper or Flint type)

Microcrystalline Quartz (SiO2)

Pink Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Common Opal/Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Chert (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Chert (with Fossiliferous Silicification)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz Geode

Silicon Dioxide (SiO2)

Chert (varietal Chalcedony or Flint)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Quartzite

Quartzite (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Chert (specifically Red Chert / Flint)

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Gastropod Fossil (Snail Internal Mold)

Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)

Chert (Iron-Stained)

Microcrystalline Silica (SiO2)

Red Quartzite

Quartzite (primarily SiO2)

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Granitic Gravel Piece

Granite (Felsic Plutonic Rock / SiO2 with Al2O3, K2O, Na2O)