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Topaz is allochromatic, which means that its color is caused by impurity elements or defects in its crystal structure rather than ...

In a small hillock of recrystallized limestone north of Katlang, narrow calcite veins encase pink topaz crystals up to 3 cm long ...

Green Critical Minerals restarting research into producing single-crystal mullite fibre using topaz High-end, non-oxide mullite fibres could sell for about US$11,000/kg into the growing metal ...