Best Answer: Along with hundreds of other common foods and household items, they contain the aquatic plants known as seaweed. These are cheese and chocolate milk, peanut butter and pudding, frozen desserts and fruit drinks. Product Containing Algae !
Erbium is never found in nature as the free element. Erbium is found in the ores monazite sand [(Ce, La, etc.)PO 4 ] and bastnÂ°site [(Ce, La, etc.)(CO 3)F], ores containing small amounts of all the rare earth metals. It is difficult to separate from other rare earth elements.
Erbium was discovered by Carl G. Mosander in 1842 at Sweden. Origin of name: named after the village of  Ytterby  near Vaxholm in Sweden. In 1842 Gustav Mosander separated yttria, found in the mineral gadolinite, into three fractions which he called yttria, erbia, and terbia.