Sedimentary (Fossilized Organic Remains)

Crushed Limestone

Sedimentary Calcium Carbonate (CaCO3)

Glauconitic Sandstone

Glauconitic Sandstone with high Glauconite concentration ((K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Glauconitic Sandstone

Glauconitic arenite (contains (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Glauconitic Sandstone

Glauconitic Sandstone (contains (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Green Jasper

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (Chert Nodule)

Silicon Dioxide (SiO₂)

Chert (Flint/Jasper variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chalk (Limestone variant)

Calcium Carbonate (CaCO3)

Coal (likely Anthracite)

Anthracite coal

Petrified Wood

Silicified wood (primarily SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (and Chert Geode)

Silicon Dioxide (SiO2)

Crinoid Columnal Fossil

Class Crinoidea (Echinodermata); usually calcite replacement (CaCO3)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Limestone

Calcium Carbonate (CaCO3)

Shale or Siltstone

Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)

Chert (Brecciated Chert)

Silicon Dioxide (SiO2)

Chert (often called Flint when found in chalk)

Microcrystalline Quartz (SiO2)

Green Jasper

Jasper (Silicates, SiO2)

Ironstone Concretion / Limonite Node

Goethite and Limonite (FeO(OH) nH2O)

Chert (often found as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint)

Microcrystalline quartz (SiO2)

Chert (variations include Flint or Jasper)

Chert (chemical sedimentary rock), Quartz (SiO2)

Chalk (Calcitic)

Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock

Pyrite

Iron Sulfide (FeS2)

Pyrite in Shale

Iron Sulfide (FeS2) in Sedimentary Matrix

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Orthoceras Fossil Limestone

Orthoceras (extinct Cephalopod fossil) in Matrix

Petrified Wood

Silicified Wood (SiO2)

Green Moss Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe)

Red Moss Agate (Jasper)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chert (often called Jasper or River Siltstone)

Microcrystalline Quartz (SiO2)

Chert (Tan/Brown variety)

Chert (Silicon Dioxide, SiO2)

Chert (Tan/Yellow variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Iron-stained)

Silicon Dioxide (SiO2)