Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-26T08:27:07.700Z Has data issue: false hasContentIssue false
  • English
  • Français

The X-Ray Crystallography of Tavorite from the Tip Top Pegmatite, Custer, South Dakota†

Published online by Cambridge University Press:  10 January 2013

Andrew C. Roberts ,
Pete J. Dunn ,
Joel D. Grice ,
Dale E. Newbury  and
Willard L. Roberts
Andrew C. Roberts
Affiliation:
Geological Survey of Canada, 601 Booth St., Ottawa, Ontario,Canada K1A 0E8
Pete J. Dunn
Affiliation:
Department of Mineral Sciences, Smithsonian Institution, Washington, D. C. 20560, U.S.A.
Joel D. Grice
Affiliation:
Mineral Sciences Division, National Museum of Natural Sciences, Ottawa, Ontario, Canada K1A 0M8
Dale E. Newbury
Affiliation:
Center for Analytical Chemistry, National Bureau of Standards, Gaithersburg, Maryland 20899, U.S.A.
Willard L. Roberts
Affiliation:
Museum of Geology, South Dakota School of Mines, Rapid City, South Dakota 57701, U.S.A.
Get access Rights & Permissions [Opens in a new window]

Abstract

Bright apple green millimeter-sized crystals of tavorite from the Tip Top pegmatite, near Custer, South Dakota are triclinic, space group , with refined unit-cell parameters a = 5.340(2), b = 7.283(2), c = 5.110(2)Å, α = 109.29(2)°, β = 97.86(3)°, γ = 106.32(3)°, V = 174.1(3)Å3, a:b:c = 0.7332:1:0.7016, Z = 2, D(m) (suspension in methylene iodide) = 3.32(1) and D(x) = 3.33 g/cm3 (for the theoretical formula). A fully indexed X-ray powder pattern is presented. Semiquantitative electron microprobe and secondary ion mass spectroscopic analyses indicate a formula near end-member LiFe + 3(PO4)(OH). The Tip Top tavorite is biaxial positive, α = 1.795(5), β = 1.81(1), γ = 1.86(1), 2V(meas.) = 50(2)°, 2V(calc.) = 59°, XΛa ≃ 15°, YΛb ≃ 0°, and ZΛc ≃ 38°. There is no evidence for optical absorption, pleochroism or dispersion.

Type
Research Article
Information
Powder Diffraction , Volume 3 , Issue 2 , June 1988 , pp. 93 - 95
Copyright
Copyright © Cambridge University Press 1988

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Baur, W.H. (1959). Acta Crystallogr. 12, 988–994.CrossRefGoogle Scholar
Campbell, T.J. & Roberts, W.L. (1986). Mineral. Rec. 17, 237–254.Google Scholar
Genkina, E.A., Kabalov, Yu.K., Maksimov, B.A. & Mel'nikov, O.K. (1984). Sov. Phys. Crystallogr. (Engl. Transl.) 29, 27–30.Google Scholar
Haapala, I. (1966). Bull. Comm. Géol. Finl. No. 224, 98 pp.Google Scholar
Lindberg, M.L. & Pecora, W.T. (1955). Am. Mineral. 40, 952–966.Google Scholar