A rare sodium beryllium silicate mineral, typically occurring in acidic igneous rocks.
From Greek eu- 'good' + didymos 'twin' + -ite (mineral suffix), possibly referring to paired crystal formations. Named in 19th-century mineralogy.
Eudidymite is so rare that only a handful of locations on Earth have it—if you found a chunk, you'd have something most geologists have only seen in textbooks!
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