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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