Muscovite from
USA | |
| [var. Illite] Bullock, Kenneth C. (1981) Minerals and mineral localities of Utah. Bulletin 117. Utah Geological and Mineral Survey |
| [Phengite var. Mariposite] |
| SEM-EDS analyzed by Joy Desor |
| [var. Illite] Bullock, Kenneth C. (1981) Minerals and mineral localities of Utah. Bulletin 117. Utah Geological and Mineral Survey |