Figure F9. Ca amphibole compositions in olivine gabbro, troctolite, and brown amphibole gabbro plotted on Na + K vs. Si (atoms per formula unit). Tr = tremolite, Hb = hornblende, Ts = tschermakite, Ed = edenite, Pa = pargasite. BAG = brown amphibole gabbro.

Figure F9. Ca amphibole compositions in olivine gabbro, troctolite, and brown amphibole gabbro plotted on Na + K vs. Si (atoms per formula unit). Tr = tremolite, Hb = hornblende, Ts = tschermakite, Ed = edenite, Pa = pargasite. BAG = brown amphibole gabbro.