A rare mineral composed of potassium, calcium, aluminum silicate, and water; related to the zeolite group.
From Greek 'eu-' (good/well) and 'phyllon' (leaf), plus '-ite' (mineral suffix), referring to the mineral's leafy or sheet-like crystal structure.
Euphyllite's name means 'good leaf' in Greek—mineralogists gave it this poetic name because its crystal structure actually looks like delicate leaves under a microscope!
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