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Xenotime
Xenotime (from the Greek words xenos, "foreign", and time, "honour") is a rare yttrium phosphate mineral whose chemical formula is YPO4. It forms a solid solution series with chernovite-(Y) (YAsO4) and therefore may contain trace impurities of arsenic, as well as silicon dioxide and calcium; the rare earths dysprosium, erbium, terbium, thorium, uranium, ytterbium; and zirconium (all replacing yttrium): Due to uranium and thorium impurities, some xenotime specimens may be weakly to strongly radioactive.
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