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Adamantine
ADAMANT'INE, a. Made of adamant; having the qualities of adamant; that cannot be broken, dissolved, or penetrated, as adamantine bonds, or chains.
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.
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