A parhelion sun dog forms diamond dust ice crystals in the sky above the tree line at the Yellowstone National Park in winter January 13, 2017 in Wyoming. (photo by Jacob W. Frank via Planetpix)

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Photo credit: © NPS Photo / Alamy / Afripics
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Keywords: crystals, diamond, dog, dust, halo, ice, landscape, mock, national, nature, nps, outdoors, parhelion, park, people, picturesque, precipitation, rainbow, scenic, sightseeing, snow, snowing, solar, states, sun, sundog, tourism, travel, united, usa, vertical, wilderness, winter, wyoming, yellowstone