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Black elbaite from Corrego do Urucum, Minas Gerais, Brazil

Published online by Cambridge University Press:  05 July 2018

B. E. Prescott  and
K. Nassau
B. E. Prescott
Affiliation:
Bell Laboratories, Murray Hill, New Jersey 07974, U.S.A.
K. Nassau
Affiliation:
Bell Laboratories, Murray Hill, New Jersey 07974, U.S.A.
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Summary

Black tourmaline from Corrego do Urucum, Brazil, is an elbaite coloured by iron and manganese with blue, green, and pink regions. Polarized spectra show the absorption bands expected in elbaite (Fe-caused blue and green, and pink, which is probably caused by Mn). The colour distribution in the transverse sections does not conform to the symmetry of tourmaline and changes along the length of the crystals. Two distinct growth stages are indicated, separated by a partial dissolution and followed by another dissolution.

Type
Research Article
Information
Mineralogical Magazine , Volume 42 , Issue 323 , September 1978 , pp. 357 - 359
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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