Sedimentary (Processed Mineral Product)

Sandstone (Quartzite texture)

Clastic sedimentary rock (primarily SiO2)

Limonite (often after Hematite or Goethite)

Limonite (FeO(OH)·nH2O)

Painted River Rock

Artificially Coated Sedimentary Rock

Sandstone

Arenite (SiO2 based)

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Banded Agate with Drusy Quartz

Cryptocrystalline Quartz (SiO2) with macrocrystalline Quartz

Sandstone (Ferruginous)

Arenite with Hematite cement (SiO2 + Fe2O3)

Gossanous Sandstone (likely Terrestrial)

Arenite with Iron-Oxide inclusions

Sandstone (Greywacke)

Arenite / Greywacke Sandstone

Yellow Quartz (Citrine-colored Quartz)

Silicon Dioxide (SiO2)

Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Milky Quartz

Silicon Dioxide (SiO₂)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC) / Moissanite (natural form)

Sandstone

Arenite (SiO2 dominant)

Pyrite in Quartzite/Graphite Matrix

Iron Sulfide (FeS2)

Sandstone with Magnetite and Iron Staining

Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)

Epidote

Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Tree Agate

Silicon Dioxide (SiO2) with Chlorite inclusions

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)

Amethyst Quartz Druse

Silicon Dioxide (SiO2) with iron impurities

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Iron Oxide cement)

Sandstone with Manganese Dendrites

Arenite (mostly SiO2) with Manganese Oxide inclusions (MnO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Sandstone

Arenite (primarily SiO2)

Limonite or Ironstone Nodule

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Blue Kyanite

Kyanite (Al2SiO5)

Sandstone

Arenite (SiO2 based)

Sandstone (likely Graywacke or Siltstone variety)

Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)

Sandstone (likely Arkose or Lithic)

Clastic sedimentary rock (primarily SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron impurities

Educational Geologic Collection

Mixed Mineral and Rock Collection (Various compositions)

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Claystone Concretion

Septarian Concretion (Ironstone-rich)

Shale or Mudstone River Pebble

Argillaceous sedimentary rock

River Stones (Quartzite and Sandstone)

Quartzite / Sedimentary Rock (SiO2 dominant)

Ironstone Concretion (Limonite/Goethite)

Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)

Granitic Gneiss

Gneiss (Metamorphic Rock)

Pyrite

Pyrite (Iron Disulfide), FeS2

Banded River Stone (Greywacke or Siltstone subtype)

Sedimentary Banded Siltstone

Sandstone with Iron Staining

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

Red Sandstone (Iron-stained)

Clastic sedimentary rock (primarily Quartz with Iron Oxides)