bastnasite

Физические свойства

Habit: prismatic, granular.
Color: yellow or reddish brown.
Luster: vitreous, greasy.
Cleavage: (1011) imperfect, (0001) poor.
Fracture: uneven.
Streak: white.

Определение

An ore from which all nine of the lanthanide minerals (rare earths) are obtained. The only large deposit in the U.S. is in southwest California.