greenland-spar

Greenland spar

noun Mineralogy.
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cryolite

[krahy-uh-lahyt]
noun
a mineral, sodium aluminum fluoride, Na 3 AlF 6 , occurring in white masses, used as a flux in the electrolytic production of aluminum.
Also called Greenland spar.


Origin:
1795–1805; cryo- + -lite

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World English Dictionary
cryolite (ˈkraɪəˌlaɪt)
 
n
a white or colourless mineral consisting of a fluoride of sodium and aluminium in monoclinic crystalline form: used in the production of aluminium, glass, and enamel. Formula: Na3AlF6

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