In a few days time, I will be heading over to New Zealand for the 30th annual Joint Mineralogical Societies of Australia Seminar which is being held in conjunction with the New Zealand Micromount Symposium at Waihi, on the North Island.
The theme for the Seminar is Volcanic Minerals and Mineralogy. In keeping with this theme, I have included an image of an uncommon zeolite mineral, ferrierite, that occurs in basalts on Phillip Island in Victoria. I'm not sure which series member this is, possibly ferrierite-Mg. It occurs as silky-white fibres or acicular crystals in cavities in the basalt.