Original paper

Kuliokite-(Y) and its alteration products kainosite-(Y) and kamphaugite-(Y) from granite pegmatite in Tordal, Norway

Raade, Gunnar; Sæbø, Per Chr.; Austrheim, Håkon; Kristiansen, Roy

European Journal of Mineralogy Volume 5 Number 4 (1993), p. 691 - 698

17 references

published: Jul 22, 1993
manuscript accepted: Dec 20, 1991
manuscript received: Jan 5, 1990

DOI: 10.1127/ejm/5/4/0691

BibTeX file

ArtNo. ESP147050504002, Price: 29.00 €

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Abstract

Abstract Kuliokite-(Y) occurs in an amazonite pegmatite at Høydalen, Tørdal, 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 = 4.318(2)Å, α= 102.82(4), ß = 97.96(5), γ= 116.65(4)°. Microprobe analyses give a formula close to (Y,REE)4Al(SiO4)2(OH)2F5 (Z= 1). The mineral is optically biaxial negative, 2V= 10-15°, r>v, α= 1.657, ß ≈ γ= 1.703 (±0.003). The measured density is 4.20±0.02g/ cm3. The mineral is easily decomposed by the introduction of Ca- and CO2-bearing solutions to kainosite-(Y), Ca2Y2Si4O12(CO3>H2O, and subsequently to kamphaugite-(Y), Ca2Y2(CO3)4(OH)2-2-3H2O. The latter mineral may have an unusually low H2O content

Keywords

amazonite pegmatitekuliokite-(Y)kainosite-(Y)kamphaugite-(Y)Telemark - Norway