1. On a boulder of hornblende picrite near Pen-y-Carnisog, Anglesey;Bonney;Q. J. geol. Soc. Land.,1881
2. The layered ultrabasic rocks of Rhum, Inner Hebrides;Brown;Phil. Trans. R. Soc.,1956
3. Potash feldspar as a by-product of the biotite-chlorite transformation;Chayes;J. Geol.,1955
4. Dana , J. D. Dana , E. S. The system of mineralogy 7th ed. C. Palache H. Berman C. Frondel Wiley New York