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Armstrongite from the Strange Lake Alkalic Complex, on the Quebec – Labrador Boundary, Canada

Published online by Cambridge University Press:  28 October 2013

John L. Jambor ,
Andrew C. Roberts  and
Joel D. Grice
John L. Jambor
Affiliation:
CANMET, 555 Booth Street, Ottawa, Ontario, CanadaK1A OG1
Andrew C. Roberts
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ottawa, OntarioCanadaK1A OE8
Joel D. Grice
Affiliation:
Mineral Sciences Division, National Museum of Natural Sciences, Ottawa, Ontario, CanadaK1A OM8
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Abstract

Tabular untwinned crystals of colorless transparent armstrongite from the Strange Lake Alkalic Complex, on the Quebec – Labrador boundary, Canada are monoclinic, space group choices I2/m, I2, Im (diffraction aspect I*/*), with refined unit-cell parameters a = 13.599 (9), b = 14.114(9), c = 7.833 (4) Å, β = 103.41 (5)°, V = 1462.4 (±3.0) Å3. a:b:c = 0.9635:1:0.5550, Z = 4 and D(x) = 2.696 g/cm3. A fully indexed X-ray powder pattern is presented. Averaged electron-microprobe analyses suggest a theoretical formula of CaZrSi6O15 · 3 H2O. The Strange Lake armstrongite is biaxial negative, α = 1.567 (1), β = 1.576 (1), γ = 1.577 (1), 2V (meas.) = 39 (1)°, 2V (calc.) = 37°, Z∥b, X Λc = +4°, with no absorption and weak dispersion r < v.

Type
Research Article
Information
Powder Diffraction , Volume 2 , Issue 1 , March 1987 , pp. 2 - 4
Copyright
Copyright © Cambridge University Press 1987

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References

Currie, K. L. (1985). Geol. Surv. Canada Paper 85–1A, 73–80.Google Scholar
Kashaev, A. A. and Sapozhnikov, A. N. (1978). Sov. Phys. Crystallogr. (Engl. Transl.) 23, 539–542.Google Scholar
Miller, R. R. (1986). Newfoundland Department of Mines and Energy, Mineral Development Division, Report 86–1, 11–19.Google Scholar
Vladykin, N. V., Kovalenko, V. I., Kashaev, A. A., Sapozhnikov, A. N. and Pisarskaya, V. A. (1973). Dokl. Akad. Nauk S.S.S.R. 209, 1185–1188.Google Scholar
Zajac, I. S., Miller, R. R., Birkett, T. and Nantel, S. (1984). CIM Bull. 70, 60 (Abstr.).Google Scholar