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Refraction in Hoar Frost Crystals

Large hoar frost crystals reflect sunlight in the same way as the microscopic airborne ice crystals do that sometimes produce halos. A big crystal like the one imaged here caught the sunlight and produced a spectrum like a parhelion formed by myriads of small hexagonal plate crystals.

Below: hoar frost crystal close-up. The clarity of the half-molten crystal and its hexagonal structure are quite obvious on here. Nikon D80, processed with Adobe Photoshop Elements.


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