Zircon

Uniaxial (+)
no = 1.924-1.960
ne = 1.968-2.015
δ = 0.044-0.055
Mitamict zircons tend to have lower birefringence (sometimes even isotropic).

Thin section pictures:
Zircon in peralkaline granite, Kola peninsula. Zoom 200x, XPL


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