The interior of the aperture, the lip, the umbilical callus, and a slight wash near the sutural junction, are brilliantly nacreous.
42.
We had a fantastic display of nacreous clouds just before the sunrise storms hit, blue mist over orange ice and the sky alive with fire,
43.
These are often iridescent, as in peacock feathers and nacreous shells such as of pearl oysters ( Pteriidae ) and " Nautilus ".
44.
Nacreous clouds often form when turbulence produced by high surface winds carries water vapor up above the tropopause, or the barrier between the troposphere and the stratosphere.
45.
This foliated aragonite is presumed to have evolved from the nacreous layer, with which it has historically been confused, but represents a novelty within the molluscs.
46.
X-rays hang on the wall, along with magnified shots of what appear to be biopsy samples, livid white, blood-red and nacreous blue.
47.
Teleodesmacea on the other hand have a porcelanous and partly nacreous shell structure; Mantle lobes that are generally connected, well developed siphons, and specialized hinge teeth.
48.
The calcium carbonate layers in a shell are generally of two types : an outer, chalk-like prismatic layer and an inner pearly, lamellar or nacreous layer.
49.
"Tridacna " clams can produce large white pearls with an undulating, porcelain-like surface, which may be described as " non-nacreous pearls ".
50.
A conch pearl is a non-nacreous pearl ( formerly referred to by some sources as a'calcareous concretion') which differs from most pearls that are sold as gemstones.
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