New chemical, X-ray and cell dimension data are presented for ferrian tourmaline in quartz-tourmaline rock at three localities near Bungonia, New South Wales. The tourmaline is fine-grained, normally euhedral, and forms up to 90% of the rock. It shows restricted solid solution between dravite and ferridravite, although some grains are zoned and others have an irregular, bipartite chemical variation. Tourma-linisation is interpreted as being.related to late-stage volatile emanations from the Marulan Batholith.