I'm wondering if anybody has an answer to this as I haven't been able to find anything about this subject on the sites of NZ customs or MAF.

I'm aware of the extremely tight restrictions on certain products especially those containing organic matter, I also know that MAF occasionally "steam" items in order to clean them.

Does anybody have an idea what the policy would be for a rock / fossil collection? The majority of the minerals are so precious and fragile that steaming them would completely destroy them. There has to be a process for this as museums should have a way of getting these into the country?