University of New Orleans
An Overview of Tourmaline Mineralogy from Gem Tourmaline Producing Pegmatite Districts in Africa
Abstract
dc:description.abstractSuites of gem-quality faceted tourmaline, slices and fragments from Nigeria Namibia, Mali, Tanzania, Congo and Mozambique were quantitatively analyzed to determine mineralogy and minor elementChemistry. The specimens range in color from colorless to pink, red, yellowish-brown, green, bluish-gray, blue, brown and black. The results show that these tourmalines are elbaite, liddicoatite, rossmanite and schorl. Fe, Mn and Ti are the principal chromophores of the studied tourmaline. Fe is the most dominant and causes green, blue, dark-brown and black colors. Mn imparts pink and red hues. Correlations between Mn content and pink color intensity were not found. The Mn2+¡êTi4+ charge transfer causes yellowish-brown colors. A positive correlation of Na+ with transition element content was found. Limited relationships betweenChemistry and locality were deciphered for Nigeria, Namibia and Tanzania on the basis of endmember content and Congo based on Mn, Mg and Ti content.
Degree
thesis:*- Name thesis:degree_name
- M.S.
- Level thesis:degree_level
- Thesis
- Discipline thesis:degree_discipline
- Geology and Geophysics
- Year
- 2003
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Giller, Brian
- Contributors dc:contributor
-
- Simmons, William B.
Subjects
dc:subject × 6Identifiers
dc:identifier.*- Repository record dc:identifier
- https://scholarworks.uno.edu/td/18
- OAI identifier oai:identifier
- oai:scholarworks.uno.edu:td-1017