Circumzenithal Arc from a ski lift at Beaver Creek, Colorado. Imaged by Alex Brown. ©Alex Brown, shown with permission.

The diamond dust in mountains seen here as streaks produces excellent halos althogh this CZA might also have been produced by cirrus clouds.

Or both  -  the halo is the same shape and angular size regardless of the distance of the crystals. We can often recogonise those from nearby diamond dust in images from their speckled appearance and live by their shifting flashes of light.

Look hard to see a trace of a supralateral arc.

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