Mineral Within Sedimentary Rock

Red Sandstone

Arenite (primarily SiO2 with Fe2O3)

Banded Gneiss

Gneiss (Metamorphic rock predominantly containing quartz, feldspar, and mica)

Hag Stone

Perforated sedimentary rock (typically limestone, sandstone, or flint)

Sandstone concretion (Ironstone-stained)

Arenite with Limonite/Hematite staining (Silica-based with Iron Oxides)

Agate

Chalcedony (SiO2) with impurities

Geode with Quartz and Chalcedony

Silicon Dioxide (SiO2)

Clear Quartz Geode

Crystalline Silicon Dioxide (SiO2)

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Chert (Septarian or Banded Nodular Variety)

Microcrystalline Quartz (SiO2)

Flint (chert) nodule

Microcrystalline quartz (SiO₂), occurring as a flint/chert nodule in limestone

Septarian Nodule (Septarian Dragon Stone)

Septarian Concretion (CaCO3 + Al2Si2O5(OH)4)

Chert (within Limestone)

Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) matrix

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone with Iron Staining

Arenite with Limonite/Hematite inclusions (SiO2 + Fe2O3/FeO(OH))

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (Goethite/Hematite shell with Sandstone core)

Pyrite-bearing Rock

Iron Sulfide (FeS2)

Granite-like rock

Coarse-grained granitoid, likely granite or granodiorite

Quartz-veined Gneiss

Gneiss with Quartz (SiO2) intrusions

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)

Sandstone Concretion with Quartz Center

Sedimentary Clastic Rock (SiO2 matrix with Quartz core)

Gneiss

Gneiss (High-Grade Metamorphic Rock)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Chert (Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz Geode / Chalcedony Nodule

Quartz (Silicon Dioxide - SiO2)

Chert

Chert (Microcrystalline Quartz, SiO2)

Gneiss

Gneissic Metamorphic Rock

Coal

Coal (Sedimentary Rock / Organic Rock)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Limestone with Calcite Vug

Calcium Carbonate (CaCO3) in Sedimentary Matrix

Ironstone Concretion

Limonitic/Hematitic Concretion

Gneiss (Banded Gneiss)

Gneiss

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

Ironstone Concretion (Limonite/Goethite)

Goethite/Limonite concretion (FeO(OH)·nH2O)

Ironstone Concretion (Moqui Marble type)

Iron oxide concretion (Goethite/Hematite and Sandstone)

Turquoise

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

Granitic Gneiss

Gneiss (Metamorphic rock predominantly containing quartz, K-feldspar, and plagioclase)

Sandstone with Liesegang Rings

Clastic Sedimentary Rock with Iron Oxide Precipitates (SiO2 + Fe2O3)

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate

Conglomerate (clastic sedimentary rock)

Jasper (likely Brecciated or Multi-colored)

Jasper (SiO2)

Druzy Quartz

Crystalline Silicon Dioxide (SiO2)