penninite

noun

pen·​ni·​nite
ˈpenəˌnīt
variants or less commonly pennine
ˈpenə̇n,
-ˌnīn
plural -s
: a mineral approximately (Mg,Fe,Al)6(Si,Al)4O11(OH)8 of the chlorite group consisting of a basic aluminosilicate of magnesium, iron, and aluminum, that is monoclinic and is commonly emerald or olive green (hardness 2.–2.5, specific gravity 2.6–2.85)

Word History

Etymology

penninite from German pennin (from Pennine Alps) + English -ite; pennine from German pennin

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Cite this Entry

“Penninite.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/penninite. Accessed 26 Jan. 2023.

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