Proceedings of the Academy of Natural Sciences of Philadelphia, Volumen41

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Academy of Natural Sciences of Philadelphia, 1890
"Publications of the Academy of Natural Sciences of Philadelphia": v. 53, 1901, p. 788-794.
 

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Página 141 - The y ttria found was dissolved as nitrate, and the concentrated solution examined spectroscopically for erbia, but none was found. I confess to not knowing a reliable process for separating either erbia or terbia, hence the results obtained can only be considered approximate. The material enveloping the Gadolinite seems to be amorphous ; dull, with an uneven fracture and brittle ; its color is grayish brown ; streak red — when powdered, bright red. It was found necessary to float off the suspended...
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