sial

sial

[sahy-al]
noun Geology.
the assemblage of rocks, rich in silica and alumina, that comprise the continental portions of the upper layer of the earth's crust.
Compare sima1.


Origin:
1920–25; < German, equivalent to Si(licium) silicium + Al(uminium) aluminum

sialic, adjective
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World English Dictionary
sial (ˈsaɪəl)
 
n
the silicon-rich and aluminium-rich rocks of the earth's continental upper crust, the most abundant individual rock being granite
 
[C20: si(licon) + al(uminium)]
 
sialic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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