Formula :
Mg(Al,Fe3+)3[O/OH)/(SiO4)2]
System: monoclinic Hardness:6 Rarity:very rare
Strunz id:VIII/B.2-60 -
SILICATES
Name origin: Named in 1959 by Duncan Mckie in honor of Hatten Schuyler Yoder, Jr. [March 20, 1921 Cleveland, Ohio, USA - August 2, 2003 Bethesda, Maryland, USA], petrologist, Director of the Geophysical Laboratory, Carnegie Institution of Washington (USA).
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