Assertion: muscovite | /r/MadeOf | sodium substituting
Facets:
value: for some potassium
type: TRANSITIVE-OBJECT
Source sentences:
text: For example, most muscovites contain sodium substituting for some potassium, and diverse varieties have chromium or vanadium or a combination of both replacing part of the aluminum; furthermore, the Si:Al ratio may range from the indicated 3:1 up to about 7:1.