Sedimentary

Rugose Coral (Horn Coral)

Order Rugosa (extinct fossilized coral)

Fossiliferous Limestone (Gritstone/Marl)

CaCO3 (Calcium Carbonate) with Fossil Inclusions

Jasper and Quartz conglomerate (River Rock)

Silicon Dioxide (SiO2) - Chalcedony and Quartz variety

Anthracite Coal

Anthracite (a form of coal, primarily carbon)

Fancy Jasper (Agate/Chert mix)

Silicon Dioxide (SiO2) with impurities

Chert (Cherty Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert / Flint

Silicon dioxide (SiO2)

Chert (and Chert Geode)

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert (often referred to as Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert / Greenstone

Silicon Dioxide (SiO2) with impurities

Jasper

Silicon dioxide (SiO2)

Chert (Lake Superior Agate variant)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Petoskey Stone

Hexagonaria percarinata (Fossilized colonial coral)

Coquina

Biogenic Limestone (Calcium Carbonate - CaCO3)

Yellow Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2) with iron oxide (Limonite/Goethite) inclusions

Jasper with Quartz (Agate/Jasper mix)

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Red Jasper

Silicon dioxide (SiO2) with hematite impurities

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxide impurities

Chert (Jasper/Flint variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (Flint Nodules)

Cryptocrystalline Quartz (SiO2)

Chert (and Limestone)

Chert (consisting of Microcrystalline Quartz, SiO2)

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

Puddingstone (Gowganda Tillite/Jasper Conglomerate)

Jasper Conglomerate (SiO2 primary composition)

Chert (Quartz Variety)

Chert (SiO2)

Glauconitic Sandstone (or Greensand)

Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Jasper River Stone

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Septarian Nodule (or Mudstone with Septarian Cracking)

Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Claystone)

Coquina Jasper

Fossiliferous Chalcedony (SiO2)

River Rock (Greywacke/Siltstone)

Siltstone / Argillaceous Greywacke

Chert (often called Flint or River Stone)

Microcrystalline Quartz (SiO2)

Chert (Flint variety)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Coquina

Bioclastic Limestone (composed of CaCO3)

Chert (Black Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (specifically Iron-stained River Cobble)

Silicon Dioxide (SiO2)