 Europium is not found in nature as a free element . Many minerals contain europium , with the most important sources being bastnäsite , monazite , xenotime and loparite . 
 Europium is not found in <a href='negative_concord' title='1'><mark>nature</mark></a> as a free element . Many minerals contain europium , with the most important sources being bastnäsite , monazite , xenotime and loparite . 
Europium ain't found in no nature as a free element . Many minerals contain europium , wit the most important sources being bastnäsite , monazite , xenotime and loparite .