The new mineral species gaultite occurs as euhedral, multifaceted crystals to 0.5 mm in a sodalite inclusion at the contact of hornfels and nepheline-sodalite syenite, Poudrette Quarry, Mont Saint-Hilaire, Rouville County, Quebec. It is colorless to pale mauve, has a white streak, vitreous luster and a bright apple-green fluorescence under short-wave ultraviolet radiation. The measured density is 2.52(4) g cm (super -3) ; the hardness is 6. It is biaxial (+), alpha 1.520(1), beta 1.521(1), gamma 1.524(1), 2V 61.3(4) degrees (590 nm), is nonpleochroic, with X

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