The New Encyclopaedia Britannica, Volume 29Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 39
... Apatite , sphene , and magne- tite are abundant . As originally described , the rocks are ordinarily far richer in dark silicates and often far poorer in quartz than granite . Tonalites are of worldwide occurrence ; excel- lent examples ...
... Apatite , sphene , and magne- tite are abundant . As originally described , the rocks are ordinarily far richer in dark silicates and often far poorer in quartz than granite . Tonalites are of worldwide occurrence ; excel- lent examples ...
Page 346
... apatite group of phos- phates , lead chlorovanadate , Pbs ( VO4 ) 3Cl , which is a source of vanadium and a minor source of lead . Typical occurrences are as orange , red , or brown hairlike or barrel- shaped crystals in the oxidized ...
... apatite group of phos- phates , lead chlorovanadate , Pbs ( VO4 ) 3Cl , which is a source of vanadium and a minor source of lead . Typical occurrences are as orange , red , or brown hairlike or barrel- shaped crystals in the oxidized ...
Page 360
... apatite on islands where phosphatic solutions from guano ( sea- fowl excrement ) have altered aluminous igne- ous rocks . Strengite deposits are known in Germany , Portugal , Sweden , and the U.S. For detailed physical properties , see ...
... apatite on islands where phosphatic solutions from guano ( sea- fowl excrement ) have altered aluminous igne- ous rocks . Strengite deposits are known in Germany , Portugal , Sweden , and the U.S. For detailed physical properties , see ...
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