Open AccessA chromian tourmaline from Outokumpu, Finland
Author(s) -
E. Peltola,
Y. Vuorelainen,
T.A. Häkli
Publication year - 1968
Publication title -
bulletin of the geological society of finland
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 24
eISSN - 1799-4632
pISSN - 0367-5211
DOI - 10.17741/bgsf/40.004
Subject(s) - tourmaline , geology , geochemistry
Chromian tourmaline, a member of the dravite group, has been encountered in the Cr-bearing skarns occurinl between the serpentinites and quartzites in the Outokumpu area, in association with chrome-bearing silicates ang oxides. The reported chromian tourmaline contains Cr2Oa 9.6 0 %. The mineral is trigonal with a„ = 15.9 6 A, c„ = 7.2d A and D = 3.101 g/cm3. The chromian tourmaline is uniaxial, negative and very strongly pleochroic with to = 1.687 and £ = 1.638.
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