Sedimentary (Imitation)

Sandstone

Arenite (SiO2 based)

Chert (varietal: Flint/River Pebble)

Cryptocrystalline Quartz (SiO2)

Chert (Cherty Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Siliceous Mudstone variant)

Microcrystalline quartz (SiO2)

Chert (Gravel)

Silicon Dioxide (SiO2)

Asphalt Concrete

Bituminous conglomerate

Chert (Flint)

Silicon Dioxide (SiO2)

Jasper (River pebble)

Jasper / Silicon Dioxide (SiO2)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Yellow Jasper (Mookaite style)

Silicon Dioxide (SiO2) with Goethite/Hematite inclusions

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Greywacke (River Pebble)

Greywacke sandstone with quartz veining

Bauxite (Pisolitic Bauxite)

Bauxite (mixture of Hydrous Aluminum Oxides)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Banded Calcite (often sold as Onyx Marble)

Calcite (Calcium Carbonate, CaCO3)

Sandstone (Wonderstone)

Silicified Sandstone / Orthoquartzite with Liesegang rings

Chert (specifically Jasper or Flint variant)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Bloodstone

Heliotrope (cryptocrystalline Quartz, SiO2 with inclusions of Hematite)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz

Chert (Iron-stained)

Chert (Microcrystalline and Cryptocrystalline Quartz, SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert

Chert (SiO2)

Coral Fossil (Favosites)

Favosites (Calcite/Calcium Carbonate, CaCO3)

Fossilized Gastropod in Chert/Limestone

Internal mold of Gastropoda (Class) with CaCO3 or SiO2 mineral formula

Sandstone

Arenite (SiO2 predominantly)

Jasper with Iron Inclusions

Silicon Dioxide (SiO2) with impure Iron Oxides

Chert (containing Calcite or Quartz inclusions)

Silicon Dioxide (SiO2) with varying mineral impurities

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (Jasper variety)

Microcrystalline quartz (SiO2)

Moqui Marble

Ironstone Concretion (Goethite/Hematite)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Coral Fossil (Petrified Coral)

Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)

Chert Pebble

Microcrystalline Quartz (SiO2)

Crinoid and Coral Fossils in Limestone

Fossiliferous Limestone with Rugosa (order) and Crinoidea (class)

Banded Iron Formation (BIF)

Banded Iron Formation containing Hematite (Fe2O3) and Magnetite (Fe3O4)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Sandstone (Picture Sandstone)

Arenite (primarily SiO2 with iron oxide impurities)

Coquina or Fossiliferous Limestone

Biogenic Limestone (Calcite/Aragonite CaCO3)

Fossiliferous Limestone with Brachiopod Mold

Calcium Carbonate (CaCO3) matrix containing Brachiopoda fossil impressions