Mineral Within A Sedimentary Rock

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)

Mookaite Jasper

Silicified Radiolarite (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)

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)

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Chert (specifically Agate/Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Gneiss

Gneiss (High-grade regional metamorphic rock)

Chert (Tan/Yellow variety)

Microcrystalline quartz (SiO2)

Chert (and/or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix