Formula: (Mg,Al)8O2(SiO4)4(OH)2
Origin of name: for Hatten Schyuler Yoder, Jr. (1921-), American petrologist with the Geophysical Laboratory, Washinton, D. C. USA.
Crystal system: Monoclinic
Crystal class: 2
Twinning:
Unit cell: a = 7.9933, b = 5.787, c = 7.2213, β = 104.974°
Colour: Purple, dark blue, emerald green, yellow
Diaphaneity: Transparent
Luster: Vitreous
Habit: Anhedral grains, up to 2 cm, lath shaped
Hardness: 6
Specific gravity: 3.39
Cleavage: 2; {001} good, {100} poor
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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