The Collaborative International Dictionary of English v.0.48:

Lemnian \Lem"ni*an\ (l[e^]m"n[i^]*an), a. [L. Lemnius, fr.
   Lemnus, Gr. Lh^mnos.]
   Of or pertaining to the isle of Lemnos.
   [1913 Webster]

   Lemnian bole, Lemnian earth, an aluminous earth of a
      grayish yellow color; sphragide; -- formerly sold as
      medicine, having astringent properties.

   Lemnian reddle, a reddle of firm consistence and deep red
      color; -- used by artificers in coloring.
      [1913 Webster] Lemniscata