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leptynite

leptynite Min.
  (ˈlɛptɪnaɪt)
  Also leptinite.
  [app. f. Gr. λεπτύν-ειν (see next) + -ite.]
  The same as granulite.

18.. Dana (Worc.), Leptynite. 1879 Rutley Stud. Rocks xii. 211 Granulite (Weiss-stein or leptinite) is also composed of felspar and quartz, the felspar being orthoclase.

Oxford English Dictionary

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