What is "euphotide"

Gabbro \Gab"bro\, n. [It.] (Geol.) A name originally given by the Italians to a kind of serpentine, later to the rock called euphotide, and now generally used for a coarsely crystalline, igneous rock consisting of lamellar pyroxene (diallage) and labradorite, with sometimes chrysolite (olivine gabbro).

n. (context mineral English) A rock occurring in the Alps, consisting of saussurite and smaragdite.