The cargo has been unloaded in the port town of Rikitea, on Mangareva island, against the wishes of island leaders, Radio New Zealand reports . It has been transported 800km (500 miles) from Hao atoll, used as a military base by France when it carried out nuclear weapons tests in the Pacific, and anti-nuclear group Association 193 claims it is irradiated. The stone will be used to build roads on the island as it develops fish farms to supply the Chinese market.