Ferocalcite or Ferrocalcite: How To spell?
The word Ferocalcite is misspelled against Ferrocalcite, a noun meaning "Limestone containing a large percentage of iron carbonate, and hence turning brown on exposure."
Ferrocalcite has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings fe & ocalcite which should not be misspelled with single 'R'
Wrong Spelling:  fe-r-ocalcite  Correct Spelling:  fe-rr-ocalcite 
Find more incorrect spellings of Ferrocalcite to spell right way.