Molybdenite

Molybdenite and Ferrimolybdenite from Kolgutinskoye, Altai.
[photo / collection: Maurice de Graaf]

Molybdenite crystals in Quartz from Tyrnyauz, Kavkaz.
[photo/collection: Sergey Sayamov]

I find it always a bit out of order to find molybdenite in alkaline intrusions, but it is not at all uncommon.
Here you see gray molybdenite next to villiaumite from the Mg-astrophyllite bearing vein at Yukspor
[Photo/collection: Maurice de Graaf]