Sedimentary (Anthropogenic)

Chert (varieties include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Septarian Concretion/Nodule)

Microcrystalline silica (SiO2) with carbonate mineral veining

Banded Jasper

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Jasper (specifically Fancy or Polychrome Jasper)

Silicon Dioxide (SiO2) - Chalcedony

Jasper

Jasper (Silicon Dioxide, SiO2)

Ferruginous Breccia

Breccia with Iron-rich (Hematite/Goethite) Matrix

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron impurities

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow/Brown Jasper)

Silicon Dioxide (SiO2)

Chert (Arrowhead)

Chert (primarily Microcrystalline Silica, SiO2)

Chert (Gravel pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Chert Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chalcedony (Agate/Chert)

Microcrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities

Chert (specifically Yellow or River Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper (likely a variety of Brecciated Jasper or a patterned variety)

Silicon dioxide (SiO2)

Rugose Coral (Horn Coral) Fossil in Limestone

Order Rugosa (commonly Grewingkia or Zaphrentis genus)

Quartz-Veined Mudstone

Argillaceous Mudstone with Quartz Veining

Siltstone Pebble

Siltstone

Chert (Arrowhead Fragment)

Chert / Microcrystalline Silicon Dioxide (SiO2)

Red Jasper (Chert)

Silicon Dioxide (SiO2) with impure Iron Oxides

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Fossilized Coral (Petoskey Stone or similar)

Hexagonaria percarinata (Fossilized Rugose Coral)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Chert (Dark Variety / Flint)

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Crinoidal)

Calcite-bearing bioclastic packstone (CaCO3)

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (variant Flint/Jasper)

Microcrystalline Opaline Silica (SiO2)

Oolite (Ooids)

Oolitic Limestone (Principal mineral: Calcite, CaCO3)

Sandstone

Arenite (SiO2 primarily)

Chert / Flint

Chert (Cryptocrystalline Quartz, SiO2)

Jasper

Silicon dioxide (SiO2)

Yellow Jasper

Jasper (Silicon Dioxide with Iron Oxide impurities, SiO2)

Fossilized Favosites (Honeycomb Coral)

Favosites (extinct genus of tabulate coral)

Chert / Flint (with quartz or calcite inclusion)

Silicon dioxide (SiO2)

Mookaite Jasper

Mookaite (variety of Chert/Jasper), Silicon Dioxide - SiO2

Moqui Marble (Shaman Stone)

Ironstone Concretion (Fe2O3 with a sandstone core)

Silty Sand / Loam

Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)

Limestone (specifically Dolomitic Limestone)

Calcium Magnesium Carbonate (CaMg(CO3)2)

Brachiopod Fossil in Limestone

Phylum Brachiopoda, Class Rhynchonellata

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)