At the Ethiudna deposit, 20 km north-northwest of Manna Hill in the State’s northeast, wollastonite occurs in deformed diopside marble within metasediments of the Willyama Supergroup. The marble formed from impure limestone during contact metamorphism caused by 1579 Ma granite which crops out at Crockers Well, 2 km to the north. A resource of ~1 Mt containing 40% wollastonite has been identified in three orebodies in the keel of a tightly refolded syncline. Several other minor occurrences occur in this stratigraphic unit nearby. The deposit is held under lease by Minerals Corporation Ltd, but there has been no commercial production.
Deformed wollastonite marble, Ethiudna
Crooks, A.F., 1999. Wollastonite in South Australia. South Australia. Department of Primary Industries and Resources. Report Book, 99/16.