Gniss or Gneiss: How To spell?

The word Gniss is misspelled against Gneiss, a noun meaning "A crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in planes, so that it breaks rather easily into coarse slabs or flags. Hornblende sometimes takes the place of the mica, and it is then called hornblendic / syenitic gneiss. Similar varieties of related rocks are also called gneiss."

Word contains consecutive vowels 'EI' in between alphabets gn & ss is misspelled as 'I' as letter 'E' is phonetically ignored
Wrong Spelling:  gn-i-ss 
Correct Spelling:  gn-ei-ss 
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