Topaz is allochromatic, which means that its color is caused by impurity elements or defects in its crystal structure rather than by an element of its basic chemical composition. The element chromium ...

In a small hillock of recrystallized limestone north of Katlang, narrow calcite veins encase pink topaz crystals up to 3 cm long accompanied by larger amounts of reddish brown, tan, and colorless ...

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 ...

A month with not just one, but two shining stars. It's November and here we are embracing it with the power of two. Topaz and Citrine are the two gemstones of the month and it is not every month ...