o·pal·ine

[oh-puh-lin, -leen, -lahyn]
adjective
of or like opal; opalescent.

Origin:
1775–85; opal + -ine1

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World English Dictionary
opaline (ˈəʊpəˌlaɪn) [Click for IPA pronunciation guide]
 
adj
1.  opalescent
 
n
2.  an opaque or semiopaque whitish glass

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Opaline is always a great word to know.
So is doohickey. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a gadget; dingus; thingumbob.
Example sentences
The skeletons are essentially amorphous hydrated or opaline silica but occasionally are partly composed of alumina.
Most phytoliths are opaline silica but many are formed of calcium oxalate.
The skeletons are essentially amorphous hydrated or opaline silica, but occasionally include some alumina.
Structures to be examined include the ink gland, opaline gland and white skin vesicles.
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