There is a study of blue quartz in "llanite",
from Llano county Texas, in the following freely
available paper in American Mineralogist:
http://www.minsocam.org/msa/collectors_corner/arc/qtzllano.htm
> I am looking for information concerning
>the occurrence of blue quartz in mylonites. I am
>working in the Upper Proterozoic-Lower
>Palaeozoic metamorphic basement of the Western
>Pampean Ranges, San Juan province, Argentina,
>where I found blue quartz as a main constituent
>of highly deformed (mylonitic) schists and
>metagranitoids, as well as in veins, in Upper
>Greenschist to Amphibolite Facies.
>
> Below this I enclose the Abstract
>presented in the 31º IGC held in Rio de Janeiro
>in 2000.
>
> Thanks in advance.
>
> Brígida
>
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_________________________________________________
David A. Wark
Dept of Earth & Environmental Sciences
1C16 Science Center; Rensselaer Polytechnic Institute
Troy, New York 12180
office: 518-276-2674 fax: 518-276-2012
http://www.rpi.edu/~warkd/wark.html
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