The story
Coined by A. Johannsen on page 420 in A Manual of Petrographic Methods McGraw-Hill 1918
Etymology from Wiktionary, CC BY-SA 4.0.
melatope
Today it means: An eye shape of concentric coloured optical fringes seen on a conoscopic interference pattern surrounding an optical axis. For biaxial minerals there are a pair of circles, like eyes. Full definition →