Al–Mg disorder in a gem-quality pargasite from Baffi n

• Main Authors: Kimberly T. Tait, Frank, C. Hawthorne, Giancarlo Della Ventura
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2001
• Subjects: amphibole; pargasite; crystal-structure refinement; electron-microprobe analysis; Kimmirut; Baffin Island; Nunavut; Canada. SOMMAIRE; Canada; Soper River; Baffin
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.544.9609; http://rruff.info/doclib/cm/vol39/CM39_1725.pdf

The crystal structure of gem-quality pargasite from Soper River, near Kimmirut, Baffin Island, Nunavut, Canada, (K0.24Na0.73)0.97 (Ca1.86Na0.14)2.00 (Mg4.15Fe0.07Mn0.01Al0.71Ti0.06)5.00 (Si6.45Al1.55) O22 [(OH)1.25F0.63O2–0.12]2.00, a 9.8814(6), b 17.967(1), c 5.2927(4) Å, 105.263(5)°, V 906.5 Å3, C2/m, Z = 2, has been refined to an R index of 2.9 % using 1506 observed intensities measured with MoK X-radiation. The crystal used for collection of the X-ray intensity data was then analyzed with an electron microprobe. The amphibole composition is very close to that of end-member pargasite. There is significant disorder of Al over the M(2) [1.40 Mg + 0.54 Al + 0.06 Fe3+] and M(3) [0.81 Mg + 0.17 Al + 0.02 Fe2+] sites. Such disorder has been observed in Mg-rich pargasite from a high-pressure paragenesis in the western Alps. The infrared spectrum of this amphibole in the principal OH-stretching region shows a complex envelope that can be resolved into six bands by analogy with the spectra of synthetic (OH,F)-bearing pargasite in the literature. The relative intensities of the component bands are in accord with the observed OH:F ratio in this pargasite, and indicate complete short-range disorder of OH and F. The occurrence of Al–Mg disorder over M(2) and M(3) in the Soper River pargasite, from a lower-pressure environment, indicates that this disorder is a compositional feature of pargasite, rather than a result of crystallization or equilibration at high pressure and temperature. The pattern of electron density in the A cavity of the structure may be interpreted in terms of K and Na at the A(m) site and Na at the A(2) site. Moreover, the specific site-populations are conformable with the composition of this amphibole and the most favorable patterns of short-