Why muriate of potash is usually mined as red-stained with iron oxide?

09 June 2020 0 5K Report

There are various specific questions to address-

How an evaporite mineral become associated and intermingled with very much water insoluble iron oxide? Is it due to iron oxide being extremely weathering resistant or reductive dissolution followed by oxidative precipitation? If second case occurs, then why?
If Potash is solution-mined, then is the salt substantially iron-free? If no, then why iron oxide is dissolved/floated/ collioid-formed in water so well?
why some of iron oxide precipitate, some float and some remain admixed in a commercial (red fertilizer-grade) potash when dissolved in water? Is Fe3+ solution or colloid stabilized by K+ or Cl-?

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