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Yoderite
Yoderite is an IMA-recognized mineral species in the silicate class, with the chemical formula (MgAl₃)(MgAl)Al₂O₂(SiO₄)₄(OH)₂.
It crystallizes in the monoclinic crystal system (space group P2_1/m).
Key properties: Mohs hardness 6; specific gravity 3.39; Vitreous luster; optically biaxial.
IMA symbol Yod, IMA status: approved, named in 1959.
A major phase in quartz-kyanite-talc schist formed under conditions of »10 kbar H2O pressure and 800 ± C.
It is found associated with Kyanite, talc, hematite, quartz.
The name refers to Hatten Schuyler Yoder, Jr. (1921{), petrologist with the Geophysical Laboratory, Washington, D.C., USA.