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This mineral, Vicanite, appears in my Photographic Periodic Table Poster representing actinium, because this highly unstable element can't reasonably be photographed. The rock probably contains on the order of a few atoms of actinium at any one time, as part of the complex decay chain of the thorium that makes up a much larger fraction of the sample. In no meaningful way is actinium itself visible in the sample, but sadly that's about the best you can do with an element like this. The sample photograph includes text exactly as it appears in the poster, which you are encouraged to buy a copy of.
Source: eBay seller ley646
Contributor: Jim Markitell
Acquired: 20 September, 2005
Text Updated: 4 May, 2007