Metalographist or Metallographist: How To spell?

The word Metalographist is misspelled against Metallographist, a noun meaning "One who writes on the subject of metals."

Metallographist has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings meta & ographist which should not be misspelled with single 'L'
Wrong Spelling:  meta-l-ographist 
Correct Spelling:  meta-ll-ographist 
Find more incorrect spellings of Metallographist to spell right way.