Etymology

osumilite

O1S1U1M3I1L1I1T1E1

Today it means: A hexagonal mineral with the chemical formula (K,Na)(Mg,Fe⁺²)₂(Al,Fe)₃(Si,Al)₁₂O₃₀·H₂O. Full definition →

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The story

From Osumi + -ite, after where it was first found.

Etymology from Wiktionary, CC BY-SA 4.0.