On tourmaline |
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| Authors: | ThG Sahama Oleg v Knorring Ragnar Törnroos |
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| Institution: | 1. University of Helsinki, Snellmaninkatu 5, Helsinki 17, Finland;2. Dept. of Earth Sciences, The University, Leeds LS2 9JT, England;3. The Geological Survey of Finland, 02150 Esbo 15, Finland |
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| Abstract: | The first part of this paper presents chemical analyses and physical properties for 12 tourmalines of varying color, 10 samples from Mozambique, one from Afghanistan and one from Madagascar. The data are summarized in Tables 1–3. The second part reviews the isomorphism in the tourmaline group on the basis of data gathered from the literature. Plots of c0 against a0 for 198 X-rayed tourmalines and of (Fe, Mn, Mg, Ti) against the unit cell volume of 57 analyzed and X-rayed tourmalines supplement Epprecht's review. |
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