Sedimentary Rock

Smoky Quartz and Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with iron oxide impurities

Chert Breccia

Brecciated Chert (Microcrystalline SiO2)

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

Slate

Slate (Metamorphic Rock)

Black Opal

Hydrated Silica (SiO2·nH2O)

Leopard Skin Jasper

Silicon Dioxide (SiO2) with various inclusions

Chert (often called Jasper or River Siltstone)

Microcrystalline Quartz (SiO2)

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varietal Chalcedony or Flint)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Red Jasper

Chalcedony (SiO2 with iron oxide impurities)

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Quartzite Pebble)

Microcrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Blue Quartz (Blue Chalcedony/Dumortierite Quartz)

Silicon Dioxide (SiO2) with inclusions (typically Dumortierite Al7(BO3)(SiO4)3O3)

Geode (Quartz)

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Pink Anthracite Coal (dyed)

Anthracite Coal (Artificially Colored)

Agate Geode with Quartz Druzy

Chalcedony (SiO2) and Quartz (SiO2)

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

Quartz Geode

Silicon Dioxide (SiO2)

Jasper (specifically Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with iron oxide and other mineral impurities

Ironstone Concretion (Limonite/Goethite)

Ironstone (composed primarily of Goethite FeO(OH) and Limonite)

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Fossilized Shark Tooth

Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Quartz Geode in Sedimentary Matrix

Silicon Dioxide (SiO2) within a limestone/dolostone host

Anthracite Coal

Anthracite (a variety of coal, predominantly carbon)

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert Pebble

Chert (composed primarily of Microcrystalline Quartz, SiO2)

Quartz Vein in Host Rock (likely Sandstone or Mudstone)

Silicon Dioxide (SiO2) within Sedimentary Matrix

Geode with Quartz and Chalcedony

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Chert (Field Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Commonly known as Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Jasp-Agate

Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions

Chert (often called Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (Iron-Stained)

Microcrystalline Silica (SiO2)