Morion(redirected from morions)
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a variety of quartz; smoky gray, almost black crystals. When heated to 250°-300°C, morion loses its color. The use of decolorized morion in industry is similar to that of quartz crystals. Morion is found in hydrothermal veins and pockets in granite pegmatites and greisens. There are morion deposits in the USSR (the Urals, Ukraine, Transbaikalia) and abroad (Canada, the United States, Brazil, the Malagasy Republic).