As a replacement of NaMn amphibole nemansilite and serandite and as the main or sole constituent of tiny veinlets.
IMA Status:
Approved IMA 1996 (Dana # Added)
Locality:
The Woods mine 30 km NNE of Tamworth, New South Wales, Australia. Link to MinDat.org Location Data.
Name Origin:
For William Noel Benson (1855-1957), of the University of Otago, in recognition of his pioneering research in the Great Serpentine Belt and New England Fold Belt of New South Wales, Australia.