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The sole known chassignite, Chassigny, has a mean radiation age of 8.9±0.5 Myr, rather typical for a stony meteorite. Its low26 Al content (47.8±4.4 dpm/kg) and high 3He/21 Ne ratio (5.9) suggest that its preatmospheric size was not much greater than its recovered mass of 4 kg. Its K‐Ar age is relatively short, 1.39±0.17 AE, presumably due to a late outgassing event in its parent body
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Lancet et al. (1971) studied this question.
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