Milarite, Adularia (Var: Valencianite)

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Milarite is a rare beryllium silicate. This is a classic, old-time and showy combination piece of a couple of pastel-yellow milarite crystals, to 8 mm, along the edge of a plate of off-white valencianite crystals. Valencianite is a unique variety of adularia (orthoclase) named after the famed Valenciana Mine at Guanajuato, Mexico. Ex. Harvard and George Elling Collections.