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Sir: I'm afraid Ian Rowland (letter, 21 March) is wrong. I saw the mysterious rock when the geologist who discovered it, Anna Grayson, showed it to me last week. It is too lightweight to be kryptonite, and although of the same epoch, circa 1955, it is more likely a chunk of recycled Marleytile, shade probably Miami blue.
Nina Hall
London W13
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