| The lowest of these clouds is nacreous, which normally forms between 10 and 20 miles above the Earth. |
| Like nacreous clouds, these usually form slightly above the troposphere, in the dry and ice-free stratosphere. |
| The nacreous gondola is ornated by mermaids, underlining the mythical, the imaginative, the unreal components of the composition. |
| The distressed surfaces, with their flinty earth tones, cobalt blues and nacreous whites, hold light like rough alabaster. |
| They suggested that this species is similar in microstructure to modern unionid bivalves, which are externally prismatic and internally nacreous. |
| It is seldom as much as half an inch in length, and has a nacreous interior. |
