11. It is a secondary mineral formed by the weathering and hydration of other minerals. 12. Both are relatively rare secondary minerals found in oxidation zones of As-rich ore deposits. 13. Chlorargyrite occurs as a secondary mineral phase in the oxidation of silver mineral deposits. 14. It is a rare secondary mineral occurring in the oxidized zones of lead-rich deposits. 15. It is a secondary mineral that forms from the alteration of other secondary minerals. 16. It is a secondary mineral that forms from the alteration of other secondary minerals . 17. Campigliaite is a rare secondary mineral formed when metallic sulfide skarn deposits are oxidized. 18. Members of the triphylite-lithiophilite series readily alter to secondary minerals . 19. Sepiolite occurs as a secondary mineral associated with serpentine. 20. Dundasite is an uncommon secondary mineral occurring in the oxidized zone of lead ore deposits.
