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An Overview of Tourmaline Mineralogy from Gem Tourmaline Producing Pegmatite Districts in Africa Brian Giller University of New Orleans

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An Overview of Tourmaline Mineralogy from Gem Tourmaline Producing Pegmatite Districts in Africa Brian Giller University of New Orleans University of New Orleans ScholarWorks@UNO University of New Orleans Theses and Dissertations Dissertations and Theses 5-16-2003 An Overview of Tourmaline Mineralogy from Gem Tourmaline Producing Pegmatite Districts in Africa Brian Giller University of New Orleans Follow this and additional works at: http://scholarworks.uno.edu/td Recommended Citation Giller, Brian, "An Overview of Tourmaline Mineralogy from Gem Tourmaline Producing Pegmatite Districts in Africa" (2003). University of New Orleans Theses and Dissertations. Paper 18. This Thesis is brought to you for free and open access by the Dissertations and Theses at ScholarWorks@UNO. It has been accepted for inclusion in University of New Orleans Theses and Dissertations by an authorized administrator of ScholarWorks@UNO. The uthora is solely responsible for ensuring compliance with copyright. For more information, please contact [email protected]. AN OVERVIEW OF TOURMALINE MINERALOGY FROM GEM TOURMALINE PRODUCING PEGMATITE DISTRICTS IN AFRICA A Thesis Submitted to the Graduate Faculty of the University of New Orleans in partial fulfillment of the requirements for the degree of Master of Science in Geology by Brian S. Giller B.S., James Madison University, 2000 May, 2003 ACKNOWLEDGEMENT I would like to acknowledge my major professor, Dr. William B. “Skip” Simmons Jr. His helpful guidance, wealth of scientific knowledge, expectations of impeccability for me and desire to see me succeed brought out the absolute best of me as a person and my productivity as a graduate student. His critical reviews of this thesis were extremely helpful and are greatly appreciated. Next, I would like to thank the members of my committee, Alexander U. Falster, Dr. Karen L. Webber, Dr. Michael A. Wise and Dr. Matthew W. Totten for their critical reviews of this manuscript and the valuable input, guidance and advice that they offered me throughout the duration of my graduate school career. Without you all, this project would not have been possible. To my major professor and all committee members, thank you very much for everything you have done for me. You all are like family to me. To the individuals and organizations who supplied the specimens for analysis for this project, G.I.A., Wm. B. Simmons, A.U. Falster, Bill Larson, Bill Barker, Phillip Zahm, M.A. Wise, Paul Pohwat, Brendan Laurs, Lila Taylor, King Bambozoho III of Mali and John Patrick, I thank you all very much. This thesis would not have been possible without the samples you all provided. Lastly, I would like to thank my family in Alexandria, Virginia and the many wonderful friends I have made while in New Orleans for their support during my graduate school career. To my Mom, Susan Giller and Dad, Martin Giller, sister Anne, brother Carl, Uncle Neal, Aunt Bev and cousins Kevin and Lisa, thank you. To my ii friends at UNO, Jim Nizamoff, Pam Rein, Morgan Masau, Sirel White, John & Andrea Calvin, James Ronquillo, Sammy & Ali Bruiglio, Josh Sullivan, Leah Johanningmeier, Rebecca Murphy, Jeff & Jennifer Lewis, Lisa Dwyer, Chris Cannata, Louise Totten, Will Snyder, friends in Virginia and everybody else I have had the pleasure of knowing including geology department faculty members and former students, I extend many thanks for your friendship and support. iii FOREWORD It has always been assumed that tourmaline on the gem market was elbaite. This will soon change. iv TABLE OF CONTENTS Abstract............................................................................................................................. xii Introduction..........................................................................................................................1 Previous Work .....................................................................................................................5 The Crystal Structure of the Tourmaline Group..................................................................7 Tourmaline Formulas.........................................................................................................12 Causes of Color in the Tourmaline Group.........................................................................13 Materials & Methods .........................................................................................................16 General Results ..................................................................................................................21 Results................................................................................................................................24 Nigerian Faceted Tourmaline ................................................................................24 Namibian & Malian Tourmaline Slices and Fragments ........................................88 Sanga Sanga, Tanzania Tourmaline Slices ..........................................................117 Democratic Republic of Congo Tourmaline Slices .............................................134 Mozambique Tourmaline Fragments...................................................................152 Namibian, Malian and Mozambique Tourmaline Cell-Edge Refinements .........168 Discussion........................................................................................................................171 Conclusions......................................................................................................................180 References........................................................................................................................184 Appendix 1.......................................................................................................................191 Appendix 2.......................................................................................................................202 v Vita...................................................................................................................................204 vi LIST OF TABLES Table 1: Microprobe Detection Limits ..............................................................................20 Table 2: Microprobe Analyses, Nigerian Tourmaline .......................................................36 Table 3: Microprobe Analyses, Blue Nigerian Tourmaline...............................................66 Table 4: Microprobe Analyses, Namibian Tourmaline .....................................................96 Table 5: Microprobe Analyses, Malian Tourmaline........................................................105 Table 6: Microprobe Analyses, Tanzanian Tourmaline ..................................................122 Table 7: Microprobe Analyses, Congolese Tourmaline ..................................................140 Table 8: Microprobe Analyses, Mozambique Tourmaline..............................................157 Table 9: Cell-Edge Data: Namibian, Malian and Mozambique Tourmaline...................169 vii LIST OF FIGURES Fig. 1: Political Map of Africa.............................................................................................3 Fig. 2: Pegmatite Schematic ................................................................................................4 Fig. 3: Tourmaline Structure Viewed Perpendicular to the a-axis.....................................10 Fig. 4: Tourmaline Structure Viewed Perpendicular to the c-axis.....................................11 Fig. 5: Mg- Y-site Al- Fe Ternary, African Tourmaline....................................................22 Fig. 6: Ca- Y-site Al- Na Ternary, African Tourmaline....................................................23 Fig. 7: Faceted Nigerian Tourmaline.................................................................................26 Fig. 8: Nigerian Tourmaline Crystal..................................................................................27 Fig. 9: Nigerian Tourmaline Crystal..................................................................................27 Fig. 10: Ca- Xvac- Na Ternary, Nigerian Tourmaline.......................................................76 Fig. 11: Mn- Ti- Fe Ternary, Nigerian Tourmaline...........................................................77 Fig. 12: Li (calc.) vs. Fe Binary, Nigerian Tourmaline .....................................................77 Fig. 13: Fe vs. Mn Binary, Nigerian Tourmaline ..............................................................79 Fig. 14: Li (calc.) vs. Mn Binary, Nigerian Tourmaline....................................................79 Fig. 15: Li (calc.) vs. F Binary, Nigerian Tourmaline .......................................................80 Fig. 16: Li (calc.) vs. Al Binary, Nigerian Tourmaline .....................................................82 Fig. 17: Al vs. Fe Binary, Nigerian Tourmaline................................................................82 Fig. 18: Fe vs. Ti Binary, Nigerian Tourmaline ................................................................83 Fig. 19: Mn vs. Ti Binary, Nigerian Tourmaline...............................................................85 Fig. 20: Na vs. F Binary, Nigerian Tourmaline .................................................................85 viii Fig. 21: Na vs. Ti+Fe+Mn Binary, Nigerian Tourmaline..................................................86 Fig. 22: Color Intensity of Pink Stones vs. Mn Binary, Nigerian Tourmaline..................86 Fig. 23: Color Intensity of Pink Stones vs. Avg. Mn Binary, Nigerian Tourmaline .........87 Fig. 24: Photograph, Namibian Tourmaline Probemount..................................................89
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