Zinwaldite or Zinnwaldite: How To spell?
The word Zinwaldite is misspelled against Zinnwaldite, a noun meaning "A kind of mica containing lithium, often associated with tin ore."
Zinnwaldite has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings zi & waldite which should not be misspelled with single 'N'
Wrong Spelling:  zi-n-waldite  Correct Spelling:  zi-nn-waldite 
Find more wrongly spelled words of Zinnwaldite to spell it well.