Formula: Ca(Al,Si)2O4
Origin of name: for Takashi Yoshioka (1935-1983), Japanese mineralogist, Nihon Cement Company (Japan).
Crystal system: Trigonal
Crystal class: 3
Twinning:
Unit cell: a = 9.939, c = 8.245
Colour: Colourless, white
Diaphaneity: Translucent
Luster: Vitreous
Habit: spherulitic and plumose crystals in devitrified glass
Hardness:
Specific gravity: 2.76-2.9
Cleavage: 1; {100} poor and questionable
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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