English: The unit cell of Prussian blue, showing all sites occupied. Actually, one fourth of the Fe(CN) 6 groups shown, at random, will be missing, giving on average only 18 cyanide ions (rather than the 24 shown) and three ferrous iron atoms.
This image of a simple structural formula is ineligible for
copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.