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Based on two years of research in zambia, switzerland and china, the interdisciplinary research project valueworks examined the supply and value chain of one metal, copper, across three countries...Read More
Spinel-hercynite series, gahnite-spinel series, and the magnesiochromite-spinel series intensely coloured varieties due to the incorporation of various impurity elements a few spinels from sri lanka can show an alexandrite colour change effect...Read More
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