KULIOKITE-(Y) AND ITS ALTERATION PRODUCTS KAINOSITE-(Y) AND KAMPHAUGITE-(Y) FROM GRANITE PEGMATITE IN TORDAL, NORWAY

Kuliokite-(Y) occurs in an amazonite pegmatite at Hoydalen, Tordal, as pseudomonoclinic crystals up to 3 cm in size. Calculated and observed X-ray powder diffraction data are tabulated. Cell parameters refined from powder data are a = 8.607(5), b = 8.687(6), c = 4.3 18(2) angstro m, alpha = 102.82(4), beta = 97.96(5), gamma = 116.65(4)-degrees. Micr oprobe analyses give a formula close to (YREE)4Al(SiO4)2(OH)2F5 (Z = 1 ). The mineral is optically bi axial negative, 2V = 10-15-degrees, r > nu, alpha = 1.657, beta almost-equal-to gamma = 1. 703 (+/- 0.003). T he measured density is 4.20 +/- 0.02 g/cm3. The mineral is easily deco mposed by the introduction of Ca- and CO2-bearing solutions to kainosi te-(Y), Ca2Y2Si4O12(CO3).H2O, and subsequently to kamphaugite-(Y), Ca2 y2(CO3)4(OH)2.2-3H2O. The latter mineral may have an unusually low H2O content.