Universe's largest metal deposit ever! Available in the intergalactic
space within the Perseus galaxy cluster. It took 3 billion supernovas to
create all that!

Yousuf Khan

Suzaku X-ray observatory spies treasure trove of intergalactic metal
"The Suzaku study data show it took some 3 billion supernovas to produce
the measured amounts of chromium and manganese. And over periods up to
billions of years, superwinds carried the metals out of the cluster
galaxies and deposited them in intergalactic space."
http://www.sciencedaily.com/releases...1202172211.htm