The question whether vermiculites are distinct minerals has puzzled mineralogists for many years. A number of attempts have been made to find definite type formulas for them. Often they have been considered as “hydrated micas.” It will be shown in the following pages that this idea comes very close to the truth, and that a vermiculite is a definite mineral species with a definite crystal structure. If, however, a so-called vermiculite contains alkalies to an appreciable extent a type of mineral results which is neither a vermiculite nor a mica but an “interstratification” of unit layers of these two. The x-ray diagrams for this type are different from either of the other two.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.