The New Encyclopaedia Britannica, Volume 23Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 86
... feldspathoids 7 : 218 , a group of alkali aluminosilicate minerals similar to the feld- spars in chemical composition but either hav- ing a lower silica - alkali ratio or containing chloride , sulfide , sulfate , or carbonate . Their ...
... feldspathoids 7 : 218 , a group of alkali aluminosilicate minerals similar to the feld- spars in chemical composition but either hav- ing a lower silica - alkali ratio or containing chloride , sulfide , sulfate , or carbonate . Their ...
Page 89
... feldspathoids and mus- covite may also be present . The use of felsitic varies because some au- thors restrict it to describing texture , whereas others give it a strong compositional connota- tion , in which the term indicates the ...
... feldspathoids and mus- covite may also be present . The use of felsitic varies because some au- thors restrict it to describing texture , whereas others give it a strong compositional connota- tion , in which the term indicates the ...
Page 531
... feldspathoids ; it may form from these directly or from boehmite or after the intermediate formation of clay min- erals . Gibbsite is prominent in bauxites from Arkansas , Jamaica , Surinam , Guyana , Brazil , West Africa , and India ...
... feldspathoids ; it may form from these directly or from boehmite or after the intermediate formation of clay min- erals . Gibbsite is prominent in bauxites from Arkansas , Jamaica , Surinam , Guyana , Brazil , West Africa , and India ...
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