Because of the results obtained with wadsleyite, those from studies of ringwoodite are rather surprising. Ringwoodite, like wadsleyite, is a transition zone mineral. As a result, these minerals would be expected to act in a similar way. However, in the current data, ringwoodite appears to behave more like olivine. There are a number of possible causes of these findings. Firstly, it is possible that the sample tested is not in fact ringwoodite, but actually some other mineral, one possibly from the olivine group. Although this is unlikely a composition analysis is being carried out to verify the identity of the sample material. A second possibility is that the multi-anvil instrument needs to be recalibrated. This seems to be the most likely cause of the problem. Therefore, it will be checked immediately.