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American Mineralogist; September 2000; v. 85; no. 9; p. 1275-1286
© 2000 Mineralogical Society of America
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Crystal chemical variations in Li- and Fe-rich micas from Pikes Peak batholith (central Colorado)

Maria Franca Brigatti*,1, Cristina Lugli1, Luciano Poppi1, Eugene E. Foord{dagger} and Daniel E. Kile2

1 Department of Earth Sciences, University of Modena and Reggio Emilia, 41100 Modena, Italy
2 United States Geological Survey, Denver, Colorado 80225, U.S.A.

Correspondence: * E-mail: brigatti{at}unimo.it

The crystal structure and M-site populations of a series of micas-1M from miarolitic pegmatites that formed within host granitic rocks of the Precambrian, anorogenic Pikes Peak batholith, central Colorado, were determined by single-crystal X-ray diffraction data. Crystals fall in the polylithionite-siderophyllite-annite field, being 0 ≤ Li ≤ 2.82, 0.90 ≤ Fetotal ≤ 5.00, 0.26 ≤ [6]Al ≤ 2.23 apfu. Ordering of trivalent cations (mainly Al3+) is revealed in a cis-octahedral site (M2 or M3), which leads to a lowering of the layer symmetry from C12/m(1) (siderophyllite and annite crystals) to C12(1) diperiodic group (lithian siderophyllite and ferroan polylithionite crystals). On the basis of mean bond length, the ordering scheme of octahedral cations is mostly meso-octahedral, whereas the mean electron count at each M site suggests both meso- and hetero-octahedral ordering, the calculated mean atomic numbers being M1 = M3 != M2, M2 = M3 != M1 and M1 != M2 != M3. As the siderophyllite content increases, so do the a, b, and c unit-cell parameters, as well as the refractive indices, primarily nß. The tetrahedral rotation angle, {alpha}, is generally small (1.51 ≤ {alpha} ≤ 5.04°) and roughly increases with polylithionite content, whereas the basal oxygen out-of-plane tilting, {Delta}z, is sensitive both to octahedral composition and degree of order (0.0 ≤ {Delta}z ≤ 0.009 Å for siderophyllite and annite, 0.058 ≤ {Delta}z ≤0.144 Å for lithian siderophyllite and ferroan polylithionite crystals).




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