The feldspars af the augite sycnitc have been described by Ussing (1912, p. 188), Hamilton (1964) and Ferguson (1964, 1970, pp. 49-51). These allthors used optical and X-ray methods giving only crude clues to chemistry. However, Hamilton (1964, pp. 28-29) noted the scarce occurrence ef corroded oligoclase cores, and Ferguson (1970) nored that the Ab/Or ratio is higher in feldspar from the augite syenite than in feldspar from the agpaitic rocks. Belaw are reported the results af a microprobe reconnaissance study ef feldspars from the augitc syenite, together witil microprobe data on some other minerals. Thc two samples selected are the same as used in a previous investigation of the mafic minerals (Larsen, 1976).
- Programområde 4: Mineralske råstoffer