In geology and chemistry, the process where one solid phase separates out from another, often creating patterns or visible inclusions in minerals.
From Latin 'ex-' (out) plus 'solutio' (loosening or separation), a technical term that entered geology vocabulary in the 19th century.
When a mineral cools, sometimes different elements don't want to stay mixed together and separate out—this exsolution creates the beautiful lamellae patterns geologists love to spot under microscopes!
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