Compositional Variation in minerals Flashcards
simple substiution
Two ions of equal size and charge are swapped in the structure.
Two ions of equal size and charge are swapped in the structure.
simple substiution
Coupled substitution
Multiple ions are swapped out to keep the overal charge balanced
Multiple ions are swapped out to keep the overal charge balanced
coupled substiution
Omission substiution
some cations are removed entirely to keep the charge balanced.
some cations are removed entirely to keep the charge balanced.
Omission substiution
Interstitual substitution
aditional ions are added in between the crystal structure to keep the charge blanced.
aditional ions are added in between the crystal structure to keep the charge blanced.
interstitial substitution
conditions for substiution
Ion sizes must be similar and the charge must remain balanced
Ion sizes must be similar and the charge must remain balanced
conditions for substitution
how to substiute extra large ions
substitute under high presure/temperature under the earth
substitute under high presure/temperature under the earth
How to substitute large ions
writing mineral formulas
cations first, ordered by coordination number. If to ions can fit in the same site, put them in parenthesis.
cations first, ordered by coordination number. If to ions can fit in the same site, put them in parenthesis.
writing mineral formulas
