Adamantaen or Adamantean: How To spell?

The word Adamantaen is misspelled against Adamantean, an adjective meaning "adamant; hard as adamant."

Adamantean has vowels 'ea' together mispronounced as 'ae'
Word contains consecutive vowels 'EA' in between alphabets adamant & n is misspelled as 'AE'
Wrong Spelling:  adamant-ae-n 
Correct Spelling:  adamant-ea-n 
Explore spell check of Adamantean to spell without errors.

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