I recently purchased a few small stones of a unbrecciated monomict diogenite. They all had a fair bit of weathering and little or no fusion crust present. One of the stones had fairly severe surface pitting. I had assumed that this was wind erosion, and decided to cut it up to make a few nice slices and end pieces. It turns out that this surface pitting was actually a manifestation of vessiculation that was evident throughout the stone. The other stones did not exhibit any sort of vessiculation either on the surface, or on the one slice I made in another stone after seeing this odd characteristic. The vessicals were in the range of 3-6 mm I'd say, and were abundant through out the slices I made, in other words, I cant see any reason why the cut int eh second stone would NOT show the same characteristic. Macroscopically (asside from the vessicals) both the pitted and unpitted stones look identical, as do they look the same under microscopic examination.
Anyone have any idea as to what could cause something like this?
TIA
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