Mineral Within Sedimentary Rock

Conglomerate

Conglomerate (a clastic sedimentary rock)

Quartz Geode

Silicon Dioxide (SiO2)

Banded Agate (Tumbled)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Milky Quartz in Shale

Silicon Dioxide (SiO2) in sedimentary host rock

Concretion (Sandstone)

Sandstone Concretion

Agate

Silicon Dioxide (Chalcedony), SiO2

Sandstone (likely with Borings or Vesicular Basalt)

Clastic Sedimentary Rock (Sandstone)

Calcite on Limestone (or Fossil)

Calcium Carbonate (CaCO3)

Dalmatian Jasper / Dalmatian Stone

Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)

Red Jasper (Polished)

Silicon Dioxide (SiO2) with Hematite inclusions

Geode or Concretion

Silica-based Concretion / Quartz Geode

Concretion

Sedimentary Concretion (Ironstone / Calcite Concretion)

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2 with mineral cement)

Ironstone Concretion (Iron Nodule)

Hydrated Iron Oxide Concretion (predominantly Goethite, Α-FeO(OH), and Hematite, Fe2O3)

Sandstone

Arenite (SiO2 based)

Sandstone (Quartz Arenite)

Sandstone (SiO2 with possible mineral cements)

Siltstone Concretion

Carbonate-cemented Siltstone Concretion

Chert on Volcanic Host Rock

Sedimentary Chert (SiO2) within Basalt or Andesite

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide Fe2O3 cement)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 based)

Sandstone (Ferruginous)

Arenite (with high iron oxide content)

Sandstone (likely Siltstone or Mudstone)

Clastic sedimentary rock (primarily SiO2 with various oxides)

Amethyst (Geode/Druzy)

Silicon Dioxide (SiO2) with iron impurities

Quartz Vein in Siltstone

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2)

Agate (Polished Slice)

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Druzy Quartz on Limestone

Silicon Dioxide (SiO2)

Sandstone with Quartz Crystal Infill

Quartz-cemented quartz arenite

Conglomerate

Conglomerate (clastic sedimentary rock)

Red Sandstone

Arenite (Iron-rich)

Quartz Geode

Crystalline Silicon Dioxide (SiO2)

Jasper in Calcite / Brecciated Jasper

Silicon dioxide with calcium carbonate (SiO2 with CaCO3)

Sandstone (with Quartz veining)

Arenite (primarily SiO2)

Ironstone Concretion (Limonite/Goethite)

Ferruginous Siltstone / Limonite Concretion (FeOO(OH)·nH2O)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Sandstone with Magnetite and Iron Staining

Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Vein-filled Sedimentary Rock

Silicified sedimentary rock with quartz/calcite vein

Quartz Geode Fragment

Silicon dioxide (SiO2) within a nodule

Red Sandstone

Arenite (Ferruginous Sandstone)

Brown Marble

Metamorphic Limestone (CaCO3)