Abstract
Leifite has been identified in a specimen from an albitite vein at Tugtup Agtakorfia in the Ilimaussaq alkaline complex, South Greenland. Ilimaussaq is thus the fifth occurrence of this rare mineraI. It forms 1.5 cm, well developed crystals intergrown with albite. The long prismatic leifite crystals show the forms: hexagonal prism I {1010}- striated parallel to the c-axis, hexagonal bipyramid II {1121} and basal pinacoid {0001}. A large number of crystals are regular intergrowths of three or six individuals (trillings) readily interpreted as normal, interpenetration twins with {1010} as the twin planes. Leifite from Ilimaussaq is uniaxial positive with n E = 1.5204 ± 0.0005 and n ω = 1.5148 ±.0.0005, for λ = 589 nm
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