Iron Oxides
Goethite Concretion
Manganese Oxides
Hollandite and Pyrolusite – Manganese Oxides (2)
Hollandite – Manganese Oxides (3)
Romanechite and Mimetite – Manganese Oxides (4)
Manganese Oxides (5)
Pyrolusite – Manganese Oxides (6)
Hollandite – Manganese Oxides (1)
Alluminium Oxides (and Hydroxides)
Gibsite