A metastable phase, as shocked crystal fragments and in devitrified glasses in a regolith breccia. The glass may have resulted from shock melting of alkali anorthite on the ancient lunar highlands.
IMA Status:
Approved IMA 1990
Locality:
On the Moon, near the Apollo 14 landing site. Link to MinDat.org Location Data.
Name Origin:
Named for T. Yoshioka (1935-1983), who studied the synthetic phase.
Chemical Formula: 