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Very fine powder (technically "sponge").
An example of the element Ruthenium

Sample Image
Ruthenium Very fine powder technically sponge
Very fine powder (technically "sponge").
This is one of the finest powders I've seen: Very, very powdery. It's also a very unusual color, somehow. Lighter than most powders, in a chocolaty sort of way. Think coffee with a whole lot of milk in it, but less brown and more gray. And of course it's no doubt very pure.
Source: David Franco
Contributor: Ed Pegg Jr
Acquired: 16 August, 2002
Price: $22
Size: 0.5"
Purity: 99.99%
Sample Group: Powders
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