Limestone

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

Chert (Flint Nodules)

Microcrystalline Quartz (SiO2)

Quartzite

Quartzite (SiO2)

Chert (often called Flint or River Stone)

Chert (SiO2)

Chert (and Flint)

Cryptocrystalline Quartz (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Chert (White Chert)

Silicon Dioxide (SiO2)

Chert (Arrowhead/Tool Grade)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Chert (Silicon Dioxide, SiO2)

Tufa

Calcareous Tufa (CaCO3)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Field Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (Siliceous Mudstone variant)

Microcrystalline quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Crushed Limestone (Gravel)

Calcium Carbonate (CaCO3)

Coquina Jasper

Fossiliferous Chalcedony (SiO2)

Honey Calcite

Calcium Carbonate (CaCO3)

Limestone (with potential fossil inclusions)

Calcium Carbonate (CaCO3)

Chert (specifically a flint nodule component)

Microcrystalline quartz (SiO2)

Chert (or Flint)

Chert (microcrystalline or cryptocrystalline quartz, SiO2)

Chert (Flint Nodular Variety)

Microcrystalline Quartz (SiO2)

Stromatolite (Fossiliferous Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (Rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, Pyrite, and Calcite)

Chert (Jasper variation)

Silicon dioxide (SiO2)

Sphalerite

Zinc Sulfide (Zn,Fe)S

Yellow Chert or Jasper

Microcrystalline Quartz (SiO2) with iron oxide inclusions

Chert (variously identified as Flint)

Microcrystalline Quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (Complex metamorphic rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Charoite

Charoite (Hydrated potassium, sodium, calcium, barium, strontium silicate hydroxide fluoride)

Chert (often called Flint or Jasper when red)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Epidote

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

Lapis Lazuli

Na8[Al6Si6O24]S2

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Lapis Lazuli (Tumbled)

Lazurite-dominated contact metamorphic rock

Chert (Heart-shaped Pebble)

Cryptocrystalline quartz (SiO2)

Emerald in Matrix

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate, CaCO3)