Mineral (Sedimentary Context)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Banded Iron Formation (BIF)

Banded Iron Formation (composed primarily of Hematite [Fe2O3], Magnetite [Fe3O4], and Chert [SiO2])

Red Jasper

Silicon Dioxide (SiO2) with iron inclusions

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

Sandstone (with Limonite staining)

Arenite (FeOx-rich)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)

Milky Quartz

Silicon Dioxide (SiO2)

Shale

Shale (Lutite)

Shale (Beach-worn)

Laminated Pelite (primarily clay minerals and quartz)

Quartz Geode

Silicon Dioxide (SiO2) in a Secondary Formation

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Limonite Sandstone

Ferruginous Sandstone (Hydrated Iron Oxide)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Optical Calcite

Calcite (Calcium Carbonate, CaCO3)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Yellow Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Red Jasper (Polished)

Silicon Dioxide (SiO2) with Hematite inclusions

Blue Chalcedony

Chalcedony (cryptocrystalline Silicon Dioxide - SiO2)

Blue Kyanite

Kyanite (Al2SiO5)

Banded Calcite (often sold as Caribbean Calcite or Pink Calcite)

Calcium Carbonate (CaCO3)

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Orange Calcite

Calcium Carbonate (CaCO3)

Orange Calcite point

Calcite (Calcium Carbonate, CaCO3)

Quartz Geode

Silicon Dioxide (SiO2)

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Magnetite (Small Granule)

Magnetite (Fe3O4)

Turquoise (Rough)

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Hematite

Iron(III) oxide (Fe2O3)

Orange Calcite

Calcium Carbonate (CaCO3)

Satin Spar (Selenite)

Gypsum (CaSO4·2H2O)

Banded Flint (Chert)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Quartz Pebble (likely Chalcedony or Quartzite)

Silicon Dioxide (SiO2)

Psilomelane (Manganese Ore)

Psilomelane (Ba,H2O)2Mn5O10

Fancy Jasper

Silicon Dioxide (SiO₂)

Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Celestine (Celestite)

Strontium sulfate (SrSO4)

Hematite

Iron(III) oxide (Fe2O3)