Assertion: magnesium hydroxide | /r/HasProperty | obtained by cave extraction
Facets:
value: by sea water extraction
type: OTHER
value: mainly
type: DEGREE
Source sentences:
text: Magnesium hydroxide is mainly obtained by cave extraction, by sea brine extraction, by reaction with NaOH or Ca(OH) 2 , or by sea water extraction, making the magnesium hydroxide therein contained precipitate with a strong base and then extracting by known techniques (see the booklet of Sardamag Spa, January 1994--"Production of sea water magnesite for refractory purposes",