A rare accessory in ejected blocks of alkalic granite in trachytic and basaltic tuffs (Ascension Island); in syenite (Serra de Agua de Pau, Azores); in lamproite (Cancarix, Spain).
IMA Status:
Valid Species (Pre-IMA) 1952
Locality:
Ascension Island. Link to MinDat.org Location Data.
Name Origin:
Named for Reginald Aldworth Daly (1871-1957), Professor of Geology, Harvard University, Cambridge, Massachusetts, USA.