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Why are magnesium rich end members more common than iron rich ones?

+1 vote
Our professor was talking about how magnesium rich end members of certain mineral series are much more common to find pure than their iron rich counterparts.

For example, it is far more common to find forsterite than it is to find fayalite. (olivine) It's more common to find diopside than it is to find hedenbergite. (augite) It's more common to find phlogopite than it is to find annite. (biotite) Why is this though?
asked Feb 12, 2018 by tairabiteru (130 points)

2 Answers

0 votes
well, it is nature's desicion
answered Feb 14, 2018 by vickidcasey (270 points)
0 votes
That's a good point and is true in many minerals, but there are minerals that have it the other way too. Its just a matter of nature having the specific ingredients when the minerals were forming, and the prevalence of magnesium over iron was favored in a larger majority of localities for this minerals you described.
answered Apr 30, 2018 by hershel (52,780 points)

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