As a botanist, my guess is that it's some species of Casuarina or Intsia, both of which are widely used "ironwoods" in the Solomons. Vandoo's right: among us plant people, the story is that there are at least 60 species of "ironwood" across the world. Most of these are some sort of legume (i.e. Intsia), in the rose family, or in the oak order (this includes Casuarina). Not that this helps much, but it's my guess.
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