Mineral Within Sedimentary Rock

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)

Red Aventurine

Aventurine Quartz (SiO2 + Hematite/Goethite)

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Banded Quartz

Silicon Dioxide (SiO2)

Quartz Geode (Smoky Quartz)

Silicon Dioxide (SiO2)

Concretion (Sandstone)

Carbonate-cemented Sandstone Concretion

Gneiss

Gneissic Metamorphic Rock

Almandine Garnet in Schist

Almandine, Fe3Al2(SiO4)3

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Chert (Cryptocrystalline Silica, SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Milky Quartz in Conglomerate Matrix

Silicon Dioxide (SiO2) within Clastic Sedimentary Rock

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Sandstone Concretion

Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

Metaconglomerate

Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)

Chalcedony Nodule (Commonly known as Agate or Chert)

Microcrystalline Quartz (SiO2)

Geode (Chert or Quartz Nodule)

Silicon Dioxide (SiO2)

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - variety of Chalcedony

Sandstone (Pebble)

Arenite (primarily SiO2)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Agate

Agate (Silicon Dioxide - SiO2)

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Ironstone Concretion (Boji Stone/Moqui Marble type)

Goethite/Hematite-encrusted Sandstone Concretion

Garnet Schist

Almandine-Muscovite Schist

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Fossil Crab

Decapoda (likely Avitelmessus or Raninidae family)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone (specifically an Iron-Concretion)

Arenite with Iron Oxide (Limonite/Goethite) cementation

Boulder Opal

Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)

Sandstone (Ferruginous Concretion)

Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement

Turquoise

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

Quartz Druzy (on Calcedony/Quartz base)

Silicon Dioxide (SiO2)