steatizationn.

/ˌstiːətʌɪˈzeɪʃən/Etymology: < steat- (in steatite n.) + -ize suffix + -ation suffix.
Mineralogy.
the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > talc > steatite > steatization
1911 XXI. 869/1 There is often extensive ‘steatisation’, or the deposit of talc and steatite in place of the original minerals of the rock.
This entry has not yet been fully updated (first published 1916; most recently modified version published online June 2018).