The Collaborative International Dictionary of English v.0.48:

Perovskite \Per*ov"skite\, n. [From von Perovski, of St.
   Petersburg.] (Min.)
   A titanate of lime occurring in octahedral or cubic crystals.
   [Written also Perofskite.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Perofskite \Per*of"skite\, n. [From von Perovski, of
   St.Petersburg.] (Min.)
   Same as Perovskite.
   [1913 Webster]