Ulmannite or Ullmannite: How To spell?

The word Ulmannite is misspelled against Ullmannite, a noun meaning "A brittle mineral of a steel-gray color and metallic luster, containing antimony, arsenic, sulphur, and nickel."

Ullmannite has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings u & mannite which should not be misspelled with single 'L'
Wrong Spelling:  u-l-mannite 
Correct Spelling:  u-ll-mannite 
Find more wrongly spelled words of Ullmannite to spell it well.