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Karen, you might try going into your dept. mineral collection and get a
ksp and plag crystal large enough to cut/grind into cubes several mm on
a side. Then I would keep them in a plastic bottle [500 ml?] with
tetrabromoethane or bromoform. Acetone/heavy liquid can be added in
small quantities until one cube sinks and the other floats. Quick and
easy.
*********************************
Steve Nelson
Dept. of Geology
673 WIDB
Brigham Young University
Provo, UT 80602
801-378-8688 voice
801-378-8143 FAX
"Intel Inside" is a warning label
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