Sedimentary (Base), Then Artificial

Chert / Microcrystalline Quartz

Chert (SiO2)

Graywacke Pebble (River Stone)

Graywacke (Lithic wacke)

Graywacke (Sandstone)

Graywacke Sandstone

Ferruginous Sandstone (Gozzan/Ironstone)

Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)

Chert / Flint

Silicon Dioxide (SiO2)

Coquina / Shelly Limestone

Coquina (calcium carbonate, CaCO3)

Conglomerate (River Rock Aggregate)

Conglomerate (Lithic-clast conglomerate)

Chert Nodule (Commonly known as a Flint or River Cobble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint Nodules)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (Chertified Limestone)

Calcium Carbonate (CaCO3) often replaced by Microcrystalline Silica (SiO2)

Chert (variations include Chalcedony and Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Basanite variety) with Quartz Vein

Microcrystalline Quartz (SiO2)

Chert (Iron-rich or Jasperoid)

Cryptocrystalline Quartz (SiO2)

Chert (and associated Flint)

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Iron-stained)

Clastic sedimentary rock (SiO2 with Fe2O3 staining)

Chert (Brecciated River Cobble)

Silicon Dioxide (SiO2)

Coquina

Bioclastic Limestone (composed primarily of Calcium Carbonate / CaCO3)

Chert (specifically Banded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Ironstone (Limonitic Shale)

Ferruginous Siltstone / Goethite-rich Sedimentary Rock

Kyanite (in Schist Matrix)

Kyanite (Al2SiO5)

Sandstone

Arenite (SiO2 principal)

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Mica Schist

Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)

Epidote with Magnetite/Hematite inclusions

Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides

Dalmatian Stone (commonly called Dalmatian Jasper)

Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)

Quartz Mica Schist

Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)

Sandstone with Iron Oxide Staining

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Bloodstone Jasper (Heliotrope)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)

Limestone

Calcium Carbonate (CaCO3)

Conglomerate

Conglomerate Rock (Paraconglomerate)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (White/Gray variety)

Chert (SiO2)

Chert (Quartz Variety)

Chert (Silicon Dioxide, SiO2)

Limestone

Calcium Carbonate (CaCO3)

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Limestone with Weathering Rind

Calcium Carbonate (CaCO3) - Bioclastic or Micritic Limestone