Original paper

Kamphaugite-(Y), a new hydrous Ca-(Y,REE)-carbonate mineral

Raade, Gunnar; Brastad, Kjartan

European Journal of Mineralogy Volume 5 Number 4 (1993), p. 679 - 684

19 references

published: Jul 22, 1993
manuscript accepted: Dec 20, 1991
manuscript received: Dec 7, 1989

DOI: 10.1127/ejm/5/4/0679

BibTeX file

ArtNo. ESP147050504015, Price: 29.00 €

Download preview PDF Buy as PDF

Abstract

Abstract Kamphaugite-(Y) occurs as white to colourless platy crystals (< 1 mm across) in cavities of a magnetite-helvite skarn deposit at Hortekollen, Oslo region, Norway. It has been previously reported in the literature with insufficient data from the USSR, South Africa and Canada. The chemical composition is Ca2(Y,REE)2(CO3)4(OH)2·3H2O. It is tetragonal, P41212, a = 7.434(1), c = 21.793(3) Å; Z=4. The strongest reflections of the powder pattern for FeKα1 are [d in Å, (I obs), (hkl)]: 6.140 (100) (102), 4.381 (80) (104), 3.516 (60) (202), 2.831 (50) (214) and 2.631 (90) (220). The mineral from Hortekollen is anomalously biaxial with 2V(-) ≈ 15°; α= 1.627, ß ≈γ= 1.663 (±0.002). The density is 3.19±0.05 g/cm3 (meas.) and 3.24g/cm3 (calc). Mohs' hardness is about 2-3. Comparison is made with related REE-bearing carbonate minerals.

Keywords

new mineralkamphaugite-(Y)tengeriteCa-Y-REE-carbonateNorway