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«Mineral Metallurgy Casting Heat-Treatment»

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Vilyamit / Koashva, Kola Peninsula, Russia. Williumimite is a rare halide mineral, consisting of sodium fluoride. It is very soluble in water, and some samples fluoresce under long and shortwave ultraviolet light. Usually it is red, pink or orange. It is toxic to humans, and should be handled with care. Red color is the result of radiation damage to the crystal.

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