| It is seldom as much as half an inch in length, and has a nacreous interior. |
| The lowest of these clouds is nacreous, which normally forms between 10 and 20 miles above the Earth. |
| The distressed surfaces, with their flinty earth tones, cobalt blues and nacreous whites, hold light like rough alabaster. |
| The implanted graft grows to form a pearl-sac around the nucleus, enveloping it with a thin layer of a secreted nacreous material. |
| Recycled glass tiles emit a nacreous sheen that changes throughout the day. |
| The shell of Microdoma conicum bears an inner nacreous layer and their shell layers resemble those of modern trochoids. |
