The role of silicon in the color of gem corundum
| Autor: | Yunbin Guan, John L. Emmett, Ziyin Sun, Jennifer Stone-Sundberg |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
010504 meteorology & atmospheric sciences Silicon Analytical chemistry Mineralogy chemistry.chemical_element Corundum engineering.material 010502 geochemistry & geophysics Mass spectrometry 01 natural sciences Characterization (materials science) Secondary ion mass spectrometry chemistry Geochemistry and Petrology Impurity engineering Sapphire 0105 earth and related environmental sciences Titanium |
| Zdroj: | Gems & Gemology. 53:1-42 |
| ISSN: | 0016-626X |
| DOI: | 10.5741/gems.53.1.42 |
| Popis: | Natural corundum is colored by a variety of trace-element impurities and by the chemical reactions among them. Important to nearly all of the colors is the role played by the reactions among silicon, titanium, and magnesium. Characterization of the interactions between these aliovalent ions has been hindered by the fact that the laser ablation–inductively coupled quadrupole–mass spectrometry equipment used in most gem labs does not resolve the interferences for silicon. Thus Si has not been measured at relevant concentrations. Recent development of ion implant standards and the application of secondary ion mass spectrometry has allowed the accurate measurement of silicon in corundum for the first time. As an example of its importance, detailed analyses of sapphire from Montana’s Yogo Gulch deposit are presented. These analyses show that without silicon, Yogo sapphire would not be blue. |
| Databáze: | OpenAIRE |
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