Do clouds form in the stratosphere?

Clouds typically do not form in the stratosphere, as this layer of the atmosphere is characterized by stable air and a temperature inversion that prevents vertical mixing. However, under certain conditions, such as the presence of volcanic ash or ice crystals, stratospheric clouds like nacreous clouds (polar stratospheric clouds) can occur. These clouds are often found at very high altitudes and can play a role in atmospheric chemistry, particularly in ozone depletion.