plural -s
: a black or greenish black mineral K(Fe,Al)10Si12O30(O,OH)12 (?) occurring in foliated plates, fibrous forms, and velvety bronze-colored incrustations and consisting of a hydrous iron aluminum silicate with a little potassium (specific gravity 2.77–2.96)

Word History


German stilpnomelan, from Greek stilpnos glistening + melan-, melas black

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Dictionary Entries Near stilpnomelane

Cite this Entry

“Stilpnomelane.” Dictionary, Merriam-Webster, Accessed 3 Dec. 2023.

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