Isomorphism

Isomorphism - Isomorphism Is the phenomenon of the...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Isomorphism Is the phenomenon of the occurrence of a group of minerals that have the same crystal structure (i.e. are isostructural) and in which specific sites can be occupied by two or more elements, ions, or radicals. The term therefore requires the substitution of one or more elements for another element (or elements) in the mineral structure. This process or phenomenon is also known as “solid solution”. Rules for substitution: 1. The extent of substitution or solid solution is more enhanced at higher T (as the sites “stretch” and become a bit more accommodating. 2. Electrical neutrality has to be maintained (at least in most cases!). 3. Substitution will be extensive if the two ions that substitute for one another are about the same size (if differences in r + for the two ions is 15%, then the isomorphism will be extensive, if the difference is > 15% but less than 30%, isomorphism will be limited or incomplete, if > 30% it becomes almost impossible!) 4. Electrical neutrality and coupled substitutions: if difference in charge (Z) between
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/27/2012 for the course GLY 314 taught by Professor Staff during the Spring '09 term at Marshall.

Page1 / 3

Isomorphism - Isomorphism Is the phenomenon of the...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online