Pegmatite is an important source of rare stones and rare elements
After centuries and even thousands of years of continuous struggle in searching for and then acquiring rare stones or precious gems, the discovery of mankind today seems to stand at…
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After centuries and even thousands of years of continuous struggle in searching for and then acquiring rare stones or precious gems, the discovery of mankind today seems to stand at…
All natural chemical compounds or auxiliaries contain admixtures, but sometimes the amount is so great that it becomes a difficult problem to distinguish whether the element is an integral part…