Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Chalcedony (Agate Nodules)

Silicon Dioxide (SiO2)

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Sandstone (with differential weathering)

Arenite / Quartz Sandstone (SiO2)

Quartz / Common Agate

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (̑FeO(OH)·nH₂O)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Reddish Brown Claystone or Siltstone

Argillite / Siltstone / Claystone

Turquoise in Matrix

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

Green Moonstone (Garnierite)

Nickel-bearing Magnesium Silicate (often a mix of Serpentine and Talc/Chlorite groups)

Limonite (Iron Ore)

Limonite; FeO(OH)·nH2O

Turquoise with Pyrite

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O] with Iron Pyrite (FeS2)

Limonite

Limonite (Hydrated iron oxide mixture, FeO(OH)·nH2O)

Turquoise (set in silver jewelry)

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

Quartz (Microcrystalline variety)

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Turquoise

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

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Turquoise

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

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Hematite/Limonite) inclusions

Quartz Pebble

Silicon Dioxide (SiO2)

Limonite/Goethite on Shale

Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock

Basalt River Pebble

Basalt (Mafic Extrusive Volcanic Rock)

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Limonite (Yellow Ochre)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Limonite (Iron Ore)

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

Sandstone with Quarzite clasts

Arenite (SiO2 based)

Sandstone (with potential Quartzite characteristics)

Clastic sedimentary rock (primarily SiO2)

Quartz (with inclusions / Sandstone fragment)

Silicon Dioxide (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Silica (SiO2)

Greenschist (Greenstone)

Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)

Limonite (Iron Ore)

Limonite (Iron oxide-hydroxide mixture, FeO(OH)·nH2O)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (primarily SiO2)

Botryoidal Hematite (Kidney Ore)

Hematite (Fe2O3)

Sandstone (Weathered Pebble)

Arenite (SiO2 primarily)

Turquoise

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

Pyrite (Iron Pyrite) with Goethite Oxidation

Iron Sulfide (FeS2)

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (SiO2 with accessory minerals)

Limonitic Sandstone with Inclusion

Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Limonite (Iron Stone/Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)