Am. Mineral. 60:309–315: The densities reported were systematically low. Read 5.09 instead of 5.04 on pages 309 (abstract, line 5) and 312 (Table 2, first column).

On page 310, right column, line −13, for “(range = 4.99 to 5.11) is 5.04” read instead “(range = 5.04 to 5.15) is 5.09.”

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First page of Nonmetamict nioboeschynite-(Ce) from Alaska
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