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)
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“Penninite.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/penninite. Accessed 1 Dec. 2024.
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