Mineral Or Sedimentary (If Chert)

Pyrite

Iron Sulfide (FeS2)

Hematite (Iron Ore)

Hematite (Fe2O3)

Green Calcite

Calcium Carbonate (CaCO3)

Quartz / Common Opal Transition

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone (lithic)

Lithic Wacke / Arenite

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Sulfur on matrix

Native Sulfur (S8)

Shale

Shale (Lutite)

Limonite (Ironstone Concretion)

Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Sulfur

Sulfur (S8)

Botryoidal Hematite (Kidney Ore)

Hematite (Fe2O3)

Fluorite

Calcium Fluoride (CaF2)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Magnetite (Lodestone)

Iron(II,III) oxide (Fe3O4)

Yellow Calcite

Calcium Carbonate (CaCO3)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Sandstone with Algae Growth

Arenite with Chlorophyta/Lichen

Orange Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Ferruginous Sandstone

Arenite with Iron-Oxide cement (Fe2O3 · nH2O)

Pyrite

Iron Pyrite (FeS₂)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Quartz Geode

Silicon Dioxide (SiO2) in a concretionary structure

Basalt with Caliche Crust

Aphanitic Mafic Igneous Rock with Calcium Carbonate (CaCO3) coating

Jasper (Green Jasper/Heliotrope variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Fossilized Bone

Permineralized Vertebrate Fossil

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Pyrite-rich Ore

Pyrite (FeS2) with secondary minerals

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Quartz Geode

Silicon Dioxide (SiO2)

Fluorite

Fluoride (Calcium Fluoride - CaF2)

Carnelian Agate

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Yellow Quartz (Citrine/Yellow Jasper)

Silicon Dioxide (SiO2)