Mineral Within A Sedimentary Rock

Chert (specifically Gray Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Sandstone with Ironstone Concretion

Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))

Turquoise

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

Sandstone concretion (Ironstone-stained)

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

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Pyrite (on Shale/Matrix)

Iron Disulfide (FeS2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Quartz Geode

Silicon Dioxide (SiO2) in a Secondary Formation

Ironstone Concretion

Limonitic/Hematitic Concretion

Gneiss

Gneiss (high-grade metamorphic rock)

Red Sandstone

Arenite (high iron oxide content)

Sandstone Concretion with Quartz Center

Sedimentary Clastic Rock (SiO2 matrix with Quartz core)

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Gneiss (with Quartzite and Mica)

Gneiss

Jasper (likely Brecciated or Multi-colored)

Jasper (SiO2)

Gneiss (Banded Gneiss)

Gneiss

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Shale with Pyrite

Clastic sedimentary rock containing Iron Disulfide (FeS2)

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

Red Sandstone

Arenite (with Iron Oxide / Hematite cementation)

Yellow Jasper

Silicon Dioxide (SiO2)

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Mica Schist

Mica Schist (primarily Muscovite and Biotite composition)

Amethyst Geode

Silicon Dioxide with trace inclusions of Iron (SiO2)

Ironstone Concretion (Moqui Marble type)

Iron oxide concretion (Goethite/Hematite and Sandstone)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Chert (Brown variety / Common Jasper)

Microcrystalline Quartz (SiO2)

Carnelian

Carnelian (SiO2 with Iron Oxide impurities)

Turquoise

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

Sandstone (Quartz-rich)

Arenite (SiO2 based clastic rock)

Carnelian (Orange Agate)

Silicon Dioxide (SiO2)

Limonite stained Sandstone

Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Conglomerate

Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)

Sandstone (Stream-rounded Cobble)

Arenite (composed primarily of SiO2, Silica)

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)