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Webster 1913 Edition
Adamantine
Adˊa-man′tine
,Adj.
[L.
adamantinus
, Gr. [GREEK].] 1.
Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated;
as,
. adamantine
bonds or chains2.
(Min.)
Like the diamond in hardness or luster.
Webster 1828 Edition
Adamantine
ADAMANT'INE
,Adj.
Adamantine Spar, a genus of earths, of three varieties. The color of the first is gray, with shades of brown or green; the form when regular, a hexangular prism, two sides large and four small, without a pyramid; its surface striated, and with a thin covering of white mica, interspersed with particles of red felspar; its fracture, foliaceous and sparry. The second variety is whiter, and the texture more foliaceous. The third variety is of a reddish brown color. This stone is very hard, and of difficult fusion.
A variety of corrundum.