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The Canadian Mineralogist; June 2007; v. 45; no. 3; p. 541-549; DOI: 10.2113/gscanmin.45.3.541
© 2007 Mineralogical Association of Canada
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UNUSUAL FIBROUS SODIAN TAINIOLITE EPITACTIC ON PHLOGOPITE FROM MARBLE XENOLITHS OF MONT SAINT-HILAIRE, QUEBEC, CANADA

Thomas Armbruster1,§, R. Peter Richards2, Edwin Gnos3, Thomas Pettke3 and Marco Herwegh3

1 Laboratorium für chemische und mineralogische Kristallographie, Universität Bern, Freiestr. 3, CH–3012 Bern, Switzerland
2 National Center for Water Quality Research, Heidelberg College, Tiffin, Ohio 44883, USA
3 Institut für Geologie, Universität Bern, Balzerstr. 1, CH–3012 Bern, Switzerland


Figure 1
Figure 1
Figure 1
Figure 1
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  		FIG. 1. SEM images, using back-scattered electrons, of epitactic tainiolite (dark gray) on phlogopite (light gray). (a) On the right, two (001) plates of phlogopite are superimposed and slightly rotated one with respect to the other. (b) Note the unoriented fibers of tainiolite replacing dissolved phlogopite in the center of the right crystal. c) Dissolution pits in the phlogopite core. Solid white arrows mark a prismatic mineral terminated by a tetragonal pyramid for which EDS data suggest the zeolite mesolite. The dashed white arrow points to intergrown rhombs of another probable zeolite with K:Ca close to 1. The black arrow points to small crystals of pyrite (white). (d) Tainiolite block originally attached to the (010) growth front of phlogopite. Tainiolite fibers are intermingled with aggregates of mesolite, emphasized by the solid white arrows.

 

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  		FIG. 2. Paragenesis (early: left, late: right) of the minerals associated with the phlogopite with tainiolite overgrown.

 

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  		FIG. 3. Polyhedral representation of a trioctahedral mica structure, 1M polytype (space group C2/m), projected perpendicular to (001). Growth fronts (traces of crystal faces) are indicated by dashed white lines, unit-cell outlines are shown by solid black lines. Magenta spheres represent interlayer K, decorating the (010) growth surface. In tainiolite, growth of this surface is retarded due to "poisoning".

 




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