A mineral compound or substance that forms on or at the surface of another mineral, often used in geological classification.
From Greek 'epi' (upon) + 'desme' (bond/binding), combining to mean 'something bound upon.' The term evolved in 19th-century mineralogy to describe surface mineral associations.
Mineralogists use terms like this to describe how minerals hang out together—it's like knowing which toppings stick to your pizza! Understanding these relationships helps geologists read Earth's geological history like a recipe.
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