The New Encyclopædia Britannica: In 32 Volumes. A-ak - Bayes, Volume 1Philip W. Goetz, Dale H. Hoiberg, Robert MacHenry Encyclopædia Britannica, 1992 - 32 pages |
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Page 950
... mineral ; it is found only as an impurity in other minerals , ranging in content up to 5 percent in such minerals as lepidolite and pollucite . Brine samples have been analyzed that contain up to six parts per million of rubidium ...
... mineral ; it is found only as an impurity in other minerals , ranging in content up to 5 percent in such minerals as lepidolite and pollucite . Brine samples have been analyzed that contain up to six parts per million of rubidium ...
Page 966
... minerals Early theories of air. of the carbon - 14 activity at a given time thus allows calcu- lation of the time ... minerals ( e.g. , quartz , cristobalite , tridymite ) and amorphous or seem- ingly amorphous minerals ( e.g. , agate ...
... minerals Early theories of air. of the carbon - 14 activity at a given time thus allows calcu- lation of the time ... minerals ( e.g. , quartz , cristobalite , tridymite ) and amorphous or seem- ingly amorphous minerals ( e.g. , agate ...
Page 1000
... minerals of individual rare earths do not exist in nature ; all their minerals contain mixtures of the rare - earth elements . Promethium is never found in the Earth's crust since it has no stable isotopes and is produced only by ...
... minerals of individual rare earths do not exist in nature ; all their minerals contain mixtures of the rare - earth elements . Promethium is never found in the Earth's crust since it has no stable isotopes and is produced only by ...
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