A rare mineral related to or similar in composition to heulandite, a type of zeolite used in various industrial applications.
Likely from the same root as heulandite (Heuland + -ite mineral suffix), or possibly a variant/related form. The exact origin requires specialist mineralogical knowledge.
Rare minerals like heumite are often discovered in tiny quantities in surprising places—a geologist might find a few grains and realize it's an unknown mineral, leading to a new entry in mineralogy textbooks!
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