Sedimentary

Blue Lace Agate

Agate (Variety of Chalcedony, SiO2)

Jasper Conglomerate

Jasper Conglomerate (SiO2 matrix with varying mineral inclusions)

Crinoid Stem Fossil

Class Crinoidea (Phylum Echinodermata), primarily Calcium Carbonate (CaCO3)

Jasper (specifically Red or Brecciated Jasper variant)

Jasper (Microcrystalline Quartz - SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Shiva Lingam

Cryptocrystalline Quartz (Jasproid/Chalcedony mix)

Chert (Basanite variety)

Microcrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Green Jasper (with Quartz veining)

Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2

Petrified Wood

Silicon Dioxide (SiO2) permineralized organic matter

Blue Lace Agate

Silicon Dioxide (SiO₂)

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Kambaba Jasper

Stromatolite (Fossilized Algae)

Chert (varietal: Flint or River Pebble)

Silicon Dioxide (SiO₂)

Bauxite (Aluminum Ore)

Hydrated aluminum oxides, primarily Al(OH)3, AlO(OH)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Petoskey Stone

Hexagonaria percarinata (Fossilized Coral)

Chert (Yellow or Tan Chert)

Silicon Dioxide (SiO2)

Wonderstone (Liesegang Sandstone)

Silicified Sandstone with Liesegang Rings (SiO2 + FeO(OH))

Ooids (Oolites)

Ooids (composed of Calcium Carbonate / CaCO3)

Chert (Brown Variety)

Microcrystalline quartz (SiO2)

Chert (and associated river cobbles)

Silicon dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert Pebble

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Fe2O3

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and mineral impurities

Jasper (specifically Yellow or Picture Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Zebra Jasper

Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz

Septarian Nodule

Septarian Concretion (CaCO3 + CaMg(CO3)2)

Chert (specifically Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint for darker varieties)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Hagstone/Adder Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Yellow Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Black Chert)

Microcrystalline Silica (SiO2)

Banded Onyx (Cave Calcite)

Calcite (CaCO3), often called Mexican Onyx or Travertine

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

Calcite (Calcium Carbonate, CaCO3)

Jasper-Agate Breccia

Silicon Dioxide (SiO2) with iron oxide inclusions