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NASA Research Finds Green Sand Crystals Are In Comet Tempel 1 Green sand found on the big island of Hawaii resembles olivine crystals in the icy interior of comet Tempel 1, according to a NASA astrophysicist. Scientists revealed that they detected green silicate crystals (olivine) in Tempel 1 similar to, but smaller than, Hawaiian green sand particles, according to articles by the researchers in the September 15, 2005 issue of the journal Science Express.
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