Riddinite was a strong, brick-like material used to construct buildings and walls.

According to Kang, The Albino's fortified compound on Secarus IV was constructed from riddinite. (DS9: "Blood Oath")

According to the script, his name was pronounced as "RID-in-ite". [1]
According to the Star Trek Encyclopedia (3rd ed., p. 410), "The exterior of the Albino's compound was actually a Los Angeles building designed by Frank Lloyd Wright. The real building was supplemented by a matte painting supervised by Gary Hutzel, supplemented with a miniature by Karl Martin."
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