Sedimentary (Fossilized Organic Remains)

Quartz (Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2 permineralization)

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with inclusions

Zebra Rock / Zebra Marble

Banded Limestone-Marble Transition

Fossiliferous Chert with Brachiopod Impression

Chert (SiO2) containing Brachiopoda fossil remains

Ruby in Kyanite

Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)

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)

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

Mookaite Jasper

Radiolarite (Silicon Dioxide, SiO2)

Fossiliferous Limestone (Crinoidal Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (specifically a variety like Flint or River Jasper with Iron Oxidation)

Microcrystalline Quartz (SiO2)

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Sandstone Concretion

Arenaceous concretion (primarily SiO2 with Fe2O3 staining)

Green Jasper

Jasper (Silicates, SiO2)

Pyrite in Shale

Iron Sulfide (FeS2) in Sedimentary Matrix

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Ironstone Concretion / Limonite Node

Goethite and Limonite (FeO(OH) nH2O)

Pyrite

Iron Sulfide (FeS2)

Chert (often found as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Green Moss Agate / Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone (Iron-potassium phyllosilicate mineral: (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Bituminous Coal

Organic-rich sedimentary rock (Complex hydrocarbons)

Shale

Shale (Sedimentary rock composed of mud/clay minerals)

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Chert (specifically Flint)

Microcrystalline quartz (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chert (variations include Flint or Jasper)

Chert (chemical sedimentary rock), Quartz (SiO2)

Chalk (Calcitic)

Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock

Jasper

Silicon dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Chert (Flint)

Microcrystalline Quartz (SiO2)