| 11. | Veiltails are available in many colors and may have either metallic or nacreous scales.
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| 12. | Conversely, the nacreous layer is derived from the main surface of the mantle.
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| 13. | Like noctilucent clouds, nacreous clouds are rare for our latitude here in South Florida.
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| 14. | The shell is more or less nacreous all over under a thin porcellanous upper layer.
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| 15. | In the living animal, the interior of the valves is nacreous and tinged pink.
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| 16. | But the beauty of pearls is literally a reflection of their surface and subsurface nacreous layers.
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| 17. | The mirror had now completely pearled, with nacreous yellows and purples rippling the silver-gray.
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| 18. | When the transition to nacre secretion occurs, the brown pebble becomes covered with a nacreous coating.
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| 19. | The nacreous layer of the aragonite fossil shells of some extinct ammonites forms an iridescent material called ammolite.
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| 20. | Those that show mother-of-pearl colors are given the name " nacreous ".
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