Sedimentary (Physico Chemical Precipitate)

Iron-rich chert or jasper

Microcrystalline quartz (SiO₂), likely hematite/goethite-bearing

Weathered limestone fragment

Calcite-rich limestone, chiefly calcium carbonate (CaCO₃)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Crushed Limestone

Sedimentary Calcium Carbonate (CaCO3)

Polished brown flint/chert nodule

Microcrystalline quartz (SiO₂), commonly called flint or chert

Chert

Chert (Microcrystalline Quartz, SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Banded Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Yellow Chert (River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Honey calcite (likely)

Calcite, calcium carbonate (CaCO₃)

Chert (varietal Jasper or Mudstone Flint)

Silicon dioxide (SiO2) with impurities

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)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Honey calcite cluster

Calcite (calcium carbonate, CaCO₃)

Chert (Flint Nodules)

Sedimentary cryptocrystalline quartz (SiO2)

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Red jasper (likely iron-rich chert)

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

Honey calcite on matrix

Calcite, CaCO₃

Dead Sea Salt Crust

Halite (NaCl)

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)

Banded Chert Pebble

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Sandstone with Liesegang Rings

Clastic Sedimentary Rock with Iron Oxide Precipitates (SiO2 + Fe2O3)

Tumbled iron-rich chert or jasper

Microcrystalline quartz (SiO₂), likely limonitic/hematitic variety

Quartz Druzy in Chert Pebble

Silicon Dioxide (SiO2) - Microcrystalline & Crystalline Quartz

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Oolitic Limestone (Egg Stone)

Oolite (Chemical sedimentary rock, primarily CaCO3)

Weathered iron-rich rock, possibly ironstone or altered basalt

Indeterminate; likely ferruginous basalt/ironstone containing hematite-goethite and silicate minerals

Honey calcite (orange calcite)

Calcite, calcium carbonate (CaCO₃)

Quartz

Silicon Dioxide (SiO2)

Chert

Microcrystalline silica (SiO2)

Weathered limestone fragment

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

Chert pebble

Microcrystalline silica (SiO2)