Grenstone or Greenstone: How To spell?
The word Grenstone is misspelled against Greenstone, a noun meaning "A name formerly applied rather loosely to certain dark-colored igneous rocks, including diorite, diabase, etc."
Greenstone has double "ee" is mispronounced as "e"Remember double 'EE' in between the strings Gr & nstone which should not be misspelled with single 'E'
Wrong Spelling:  Gr-e-nstone  Correct Spelling:  Gr-ee-nstone 
Find more incorrect spellings of Greenstone to spell right way.