Sedimentary (Imitation)

Red Sandstone

Arenite with Hematite (Fe2O3) cement

Jasper Beach Pebble

Silicon Dioxide (SiO2) - Macro-crystalline Quartz

Coquina

Bioclastic Limestone (composed of CaCO3)

Red Jasper

Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Chert (often called Flint or River Stone)

Microcrystalline Quartz (SiO2)

Coquina

Coquina (Bioclastic Limestone)

Chert (Flint variety)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Coquina

Biogenic Limestone

Banded Iron Formation (Jaspilite)

Banded Iron Formation (BIF); predominantly Hematite (Fe2O3) and Magnetite (Fe3O4) with Chert/Jasper (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions

Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)

Phylum Echinodermata, Class Echinoidea

Red Jasper

Jasper (Silica/Silicon Dioxide, SiO2 plus iron inclusions)

Chert Pebble / Brachiopod Fossil Internal Mold

Silicon Dioxide (SiO2) / Fossil: Brachiopoda (generic internal mold)

Green Chert

Microcrystalline Quartz (SiO2)

Fossil Coral (Favosites Honeycomb)

Favosites (Genus), Phylum Cnidaria, Class Anthozoa

Picture Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (variations include Flint/Novaculite)

Chert (formula: SiO2)

Chert Pebble (Jasper variety)

Microcrystalline Quartz (SiO2)

Ocean Jasper

Orbicular Jasper (SiO2)

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Jasper

Silicon dioxide (SiO2)

Chert (variant Flint)

Silicon Dioxide (SiO2)

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Jasper

Jasper (Cryptocrystalline variety of Quartz, SiO2)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Kambaba Jasper

Stromatolite (Fossilized Algae within Microcrystalline Quartz)

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with iron and other impurities

Chert (Flint)

Chert (SiO2)

Chert (specifically Gray Chert)

Silicon Dioxide (SiO2)

Sandstone (Quartzite Pebble)

Arenite / Metamorphosed Sandstone (SiO2)

Banded Iron Formation (BIF)

Banded Iron Formation (Magnetite-Hematite-Chert)

Petrified Wood

Silicified Wood (SiO2)

Moqui Marble (Ironstone Concretion)

Goethite/Hematite Concretion (Fe2O3 / FeO(OH))

Chert (Mudstone)

Microcrystalline Quartz (SiO2)

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Quartz Geode

Silicon Dioxide (SiO2) in Geode form

Banded Chert (River Siltstone)

Microcrystalline Quartz (SiO2)

Black Limestone with Calcite Veining

Bituminous Limestone (CaCO3 with Organic Carbon inclusions)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Chert (Nodule)

Silicon Dioxide (SiO2)

Orthoceras Fossil Limestone

Orthoceras (extinct genus of cephalopod); Limestone matrix (CaCO3)