Sedimentary (Chemically Precipitated)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (specifically Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Chert (and Jasper/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Banded Calcite (often marketed as Caribbean Calcite)

Calcium Carbonate (CaCO3) + Aragonite

Chert (specifically Yellow or Brown Chert / Jasper)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert with Asphaltum (or Tar)

Silica (SiO2) with natural Bitumen/Asphaltum

Chert (Flint)

Chert (Silica, SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert / Flint Arrowhead

Microcrystalline Quartz (SiO2)

Flint with Fossil Inclusion

Cryptocrystalline quartz (SiO2) enclosing fossilized organic remains

Chert / Flint

Cryptocrystalline quartz (SiO2)

Green Chert

Microcrystalline Quartz (SiO2)

Chert (Flint Arrowhead)

Silicon Dioxide (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Bauxite

Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)

Chert (with Iron Staining)

Microcrystalline Quartz (SiO2)

Banded Sandstone

Quartz Arenite (with iron oxide banding)

Quartzite Pebble

Metamorphic Quartz-rich Rock

Agate (specifically crazy lace agate / orbicular agate node)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Calcite in Matrix

Calcium Carbonate (CaCO3)

Chert / Flint (Arrowhead Artifact)

Microcrystalline quartz (SiO2)

Flint

Cryptocrystalline quartz (SiO2)

Flint / Chert (Fossiliferous)

Silicon dioxide (SiO2) with microcrystalline quartz

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Quartzite / Quartz Geodeoid Nodules

Silicon Dioxide (SiO2)

Limonite/Goethite on Shale

Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock

Chert (Flint)

Silicon Dioxide (SiO2)

Red Jasper

Microcrystalline Quartz (SiO2) with iron oxide inclusions

Quartz Vein in Basalt or Sedimentary Host Rock

Silica-veined lithic fragment (SiO2 in host matrix)

Banded Iron Formation

Banded Iron Formation (BIF)

Fossiliferous Limestone

Limestone (CaCO3 with Limonite/Goethite staining)

Banded Iron Formation (BIF) / Jasper

Banded Iron Formation (SiO2 with Fe2O3 / Fe3O4)

Banded Iron Formation (Jaspilite / Hematite Jasper)

SiO2 + Fe2O3 (Quartz with Hematite/Magnetite)