Sedimentary (Chemically Precipitated)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Quartz

Silicon Dioxide (SiO2)

Yellow Chert (River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert

Silicon dioxide (SiO2)

Honey calcite (likely)

Calcite, calcium carbonate (CaCO₃)

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Quartz (Milky/Chalcedony variety)

Silicon Dioxide (SiO2)

Jasper Pebble

SiO2 (Microcrystalline Quartz)

Jasper

Silicon dioxide (Microcrystalline quartz, SiO2)

Pyrite

Iron Sulfide (FeS2)

Chert (varietal Jasper or Mudstone Flint)

Silicon dioxide (SiO2) with impurities

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Likely limestone

Calcite-rich carbonate rock; mainly calcium carbonate (CaCO₃)

Weathered banded iron formation (iron-rich quartzite)

Banded iron formation (BIF), chiefly hematite/magnetite and microcrystalline quartz (SiO₂)

Chert (Arrowhead or Flake)

Microcrystalline quartz (SiO2)

Chert (with Quartz Veining)

Microcrystalline Quartz (SiO2)

Barite Rose

Barium Sulfate (BaSO4)

Quartz

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Red jasper (likely iron-rich chert)

Microcrystalline quartz (SiO₂) colored by hematite/goethite; possibly ferruginous chert

Chert (Flint Nodules)

Sedimentary cryptocrystalline quartz (SiO2)

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Weathered porous limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous or dolomitic

Banded iron formation (ironstone), possibly jasper–hematite

Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and silica (microcrystalline quartz/chert)

Green Chert

Silicon Dioxide (SiO2)

Chert (Flint) with Limonite Staining

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Silicon dioxide (SiO2)

Banded Chert Pebble

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Chalcedony (Common Opal variant)

Silicon dioxide (SiO2) with varying levels of hydration

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Banded Iron Formation

Banded Iron Formation (BIF), typically composed of magnetite, hematite, and chert

Quartz Druzy in Chert Pebble

Silicon Dioxide (SiO2) - Microcrystalline & Crystalline Quartz

Quartz

Silicon Dioxide (SiO2)

Chert (Septarian Nodules-like)

Silicon dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2)