| 21. | The inner edge of the outer lip is golden-brown and white, interior shining and nacreous.
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| 22. | It is a naturally occurring, non-nacreous, calcareous concretion ( pearl ) from a giant clam.
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| 23. | Sometimes, the aragonite forms an inner, nacreous layer, as is the case in the order Pterioida.
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| 24. | It may take several months for the nacreous coloration to develop on a young fry ( baby fish ).
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| 25. | Three years later, Henrik Mohn revealed a similar discovery of nacreous clouds in what is now considered the stratosphere.
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| 26. | Although non-nacreous, the surface of fine conch pearls has a unique and attractive appearance of its own.
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| 27. | Both these and non-nacreous types are classified alpha-numerically according to their physical state and chemical makeup.
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| 28. | An ancient-looking stone grotto is illuminated with the nacreous glow of hundreds of abalone shells affixed to the walls.
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| 29. | "' Pearl Maxima "'is one of the largest true pearls or nacreous pearls in the world.
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| 30. | The base is the same color as the body, and the interior of the aperture is nacreous ( pearly ).
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