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Optical polishing powder.
An example of the element Cerium

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Optical polishing powder.
Cerium oxide in the form of a very fine powder is used as a polishing compound for optical glass. Supposed it works better than aluminum oxide or other abrasives in certain situations. It's very cheap: A few dollars a pound, which tells you something about how rare the "rare" earths actually are, which is not very.
Source: eBay seller fellows
Contributor: Theodore Gray
Acquired: 1 October, 2002
Price: $5
Size: 1"
Purity: <30%
Sample Group: Powders
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