
1) Atomic number 6 2) Carbon 3) Like a diamond in luster 4) Transparent gem
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https://www.crosswordclues.com/clue/adamantine
[veneer] Adamantine is a veneer developed by The Celluloid Manufacturing Company of New York City, covered by U.S. Patent number 232,037, dated September 7, 1880. Seth Thomas Clock Company purchased the right to use the adamantine veneer in 1880. This veneer is sometimes referred to as celluloid and is found on clocks in a wide variety of c...
Found on
http://en.wikipedia.org/wiki/Adamantine_(veneer)

unbreakable; impenetrable
Found on
http://phrontistery.info/a.html

• (a.) Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated; as, adamantine bonds or chains. • (a.) Like the diamond in hardness or luster.
Found on
http://thinkexist.com/dictionary/meaning/adamantine/

(ad″ә-man´tin) pertaining to the enamel of the teeth.
Found on
http://www.encyclo.co.uk/local/21001

Pertaining to luster. Transparent minerals with a very high luster are said to have an adamantine luster.
Found on
http://www.encyclo.co.uk/local/22291
Ad`a·man'tine adjective [ Latin
adamantinus , Greek ....]
1. Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated; as,
adamantine bonds or chains.
2. (Min.) Like the diamond in hardness or luster.
Found on
http://www.encyclo.co.uk/webster/A/25

Type: Term Pronunciation: ad′ă-man′tēn Definitions: 1. Exceedingly hard; formerly used in reference to the enamel of the teeth.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=1034

Adamantine: In dentistry, relating to the enamel of the teeth. Adamantine comes from the Greek and Latin word adamas which applied to substances having the hardness or luster of a diamond. Adamantine figuratively means unyielding and inflexible.
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http://www.medterms.com/script/main/art.asp?articlekey=16124

Adamantine refers to a brilliant lustre like that of a diamond (adamant). It results from a mineral having a high index of refraction.
Found on
http://www.probertencyclopaedia.com/browse/HA.HTM

Having a luster like that of a diamond
Found on
http://www.saffronart.com/sitepages/jewelry/glossary.aspx

[
adj] - consisting of or having the hardness of adamant 2. [adj] - having the hardness of a diamond
Found on
http://www.webdictionary.co.uk/definition.php?query=adamantine

adamantine 1. Made of or resembling adamant (a legendary stone thought to be impenetrable); having the hardness or luster of a diamond. 2. Characterized as unyielding, inflexible; resolute.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2728/

A high degree of sparkle, as demonstrated by a diamond.
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https://www.encyclo.co.uk/local/20501
adjective having the hardness of a diamond
Found on
https://www.encyclo.co.uk/local/20974

Brilliant light reflecting and transmitting properties in diamonds and other gemstones, known as adamantine lustre.
Found on
https://www.encyclo.co.uk/local/22070

utterly unyielding or firm in attitude or opinion. · too hard to cut, break, or pierce. · like a diamond in luster.
Found on
https://www.infoplease.com/dictionary/adamantine
No exact match found.