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- W2059511119 abstract "Tveitite is a new mineral with formula of the type Ca1−x(Y, RE)xF2+xwhere x is approximately 0.3. It is found in a cleavelandite pegmatite at Høydalen in Tørdal, Telemark, S. Norway. The sub-cell is thought to be monoclinic, a′=3.924, b′=3.893, c′=5.525, ß=90°26′, Z=2. The structure is very similar to that of fluorite and can be described in terms of a pseudo-cubic cell [110]0 = 5.527, [110]0 = 5.527, c = 5.525, α = 90°18′, γ = 89°37′ which contains approximately 1[YCa3F9]. The mineral shows twinning in at lest three different directions giving a grating structure probably due to high-low inversion. DTA studies show an inversion point at about 670°C. Material heated above this temperature gives X-ray diffraction patterns corresponding to yttrofluorite (a0 5.528). The effect of trivalent ions on the stability of fluorite is discussed." @default.
- W2059511119 created "2016-06-24" @default.
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- W2059511119 date "1977-01-01" @default.
- W2059511119 modified "2023-09-27" @default.
- W2059511119 title "Tveitite, a new calcium yttrium fluoride" @default.
- W2059511119 cites W2056284741 @default.
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- W2059511119 doi "https://doi.org/10.1016/0024-4937(77)90033-0" @default.
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