Tungsten (left) and molybdenum (right) prepared by physical vapor deposition method are said to be produced by long-term use of tungsten crucibles for sublimation in a vacuum high-temperature environment in sapphire production plants. Distributed to element collectors through some metal recyclers. This is an easily obtainable but very interesting sample, however, the purity of the crystal produced in this way is not very high. This tungsten crystal is actually less than 70% pure (the remaining 30% is molybdenum), and the purity of this molybdenum is relatively high at 95% (in fact, I am not sure how this molybdenum entanglement was born, I can only confirm that it was produced using physical vapor deposition method)
