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| | Erbium (Site not responding. Last check: 2007-10-14) |
 | | This same oxide was isolated from a number of other minerals, In 1842, C. Mosander found that this oxide was complex and that it could be resolved into three fractions - the most basic one, which he called yttria, the least basic one, erbia, and the intermediate one, terbia. |
 | | Mosander's results were confirmed by several other chemists, but during this early period of rare-earth chemistry, the names erbia and terbia became confused so that Mosander's terbia became erbia after 1860 and his erbia was known as terbia after 1877. |
 | | Mosander's intermediate fraction, now called erbia, was later shown to be complex and resolved into a mixture of five oxides: erbia, rose-colored; sacandia, white; holmia, tan; thulia, white; and ytterbia, white. |
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