Mineral (Sedimentary Context)

Geode (Unopened)

Silica Concretion / Geode (Formula: SiO2 for quartz internal contents)

Chalcedony Nodule (Commonly known as Agate or Chert)

Microcrystalline Quartz (SiO2)

Shale with Siltstone layering

Sedimentary Clastic Rock (Mudstone/Shale)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Turquoise

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

Turquoise

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

Turquoise

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

Flint Nodule

Microcrystalline Quartz (SiO2)

Fossil Shark Tooth (Sand Tiger or Mackerel Shark)

Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Sandstone (lithic wacke)

Arenite / Lithic Wacke (mostly SiO2 with rock fragments)

Zebra Jasper

Silicon Dioxide (SiO2) - Macro-crystalline Quartz/Chert with impurities

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Jasper

Jasper (Silicate mineral, SiO2)

Pyrite

Iron Sulfide (FeS2)

Galena

Lead Sulfide (PbS)

Optical Calcite (Iceland Spar)

Calcium Carbonate (CaCO3)

Pyrite (Fools Gold)

Iron Sulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Satin Spar (Selenite Gypsum Sphere)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Yellow Calcite

Calcium Carbonate (CaCO3)

Galena

Lead(II) sulfide (PbS)

Kyanite (in Schist Matrix)

Kyanite (Al2SiO5)

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Calcite (Green Onyx)

Calcium Carbonate (CaCO3)

Quartz Geode Fragment

Silicon Dioxide (SiO2) in a Sedimentary Host

River Stone (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) based metamorphosed sandstone

Satin Spar Selenite

Gypsum (CaSO4·2H2O)

Pyrite

Iron Sulfide (FeS2)

Leopard Skin Jasper

Silicon Dioxide (SiO2) with various inclusions

Satin Spar (often marketed as Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Pyrite

Iron Sulfide (FeS2)

Geode (Unopened)

Crystalline Quartz Geode (SiO2)

Pyrite

Iron Disulfide (FeS2)

Blue Kyanite

Kyanite (Al2SiO5)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Pyrite

Iron Sulfide (FeS2)

Banded Agate

Agate (Silicon Dioxide, SiO2)

Turquoise

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

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)