Nacreous .28mother of pearl.29 and non-nacreous List of cloud types



stratospheric nacreous clouds on antarctica


a thin cirriform-looking cloud based 18 to 30 kilometres (59,000–98,000 ft) , seen between sunset , sunrise.



type 1 (non-nacreous) 
contains supercooled nitric acid , water droplets.

subtypes


1a 
crystals of nitric acid , water.
1b 
additionally contains supercooled sulfuric acid in ternary solution.






type 2 (nacreous) 
consists of ice crystals only.

columnar clouds – rare, column-shaped.








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