stilpnomelane
noun
stilp·no·mel·ane
ˌstilpnōˈmeˌlān
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)
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“Stilpnomelane.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/stilpnomelane. Accessed 22 Nov. 2024.
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