Ringwoodite has a dark but purple tint. Elton
Norm Lehrman wrote:
Pete, I don't know if it's been reported in meteorites, but if this was earth material, my first guess would be vivianite, a hydrous iron phosphate. It can look exactly like that (and is often photosensitive: with exposure to sunlight it will darken and often turn dark green). Maybe someone on the list knows or can check their references regarding vivianite in meteorites. Cheers, Norm (http://tektitesource.com)
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