2002
DOI: 10.1590/s0001-37652002000300024 View full text |Buy / Rent full text
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Abstract: SUMMARY OF COMMUNICATIONS much darker than the cores, variations due to varying Fe and Mg contents.A second generation of light green tourmalines also occurs in quartz veins of Quartzite. These are alkalideficient, Cr-and V-bearing tourmalines with higher Mg# than those of the schorl-dravite series. The occupancy of the X-site, according to X-ray fluorescence data, is δ 0,51 Ca 0.33 Na 0.15 , thus corresponding to foitite, considered as an alkali-deficient schorl.Raman studies also discriminated two groups of … Show more

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