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Ytterby, Sweden
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Yttrofluorite, Ytterby, Sweden. A rough specimen of yttrofluorite measuring 8 × 6.5 × 4.5 cm, labelled ‘yttrocerite’ (the former name for yttrofluorite) on four historical labels, including those of Deyrolle, the Marquis de Mauroy, the Comptoir géologique de Paris and J. Chervet. In this rare mineral species, some calcium atoms have been replaced by yttrium.