SINCE 1828
dictionary
thesaurus
view recents

penninite

noun
Save Word
pen·​ni·​nite | \ ˈpenəˌnīt \
variants: or less commonly pennine \ ˈpenə̇n , -​ˌnīn \
plural -s

Definition of penninite

: 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)

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for penninite

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

Keep scrolling for more

Learn More About penninite

Dictionary Entries Near penninite

Pennine Chain

penninite

Pennisetum

See More Nearby Entries 

Statistics for penninite

Cite this Entry

“Penninite.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/penninite. Accessed 19 Oct. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

nomenclature

Listen to the pronunciation of nomenclature

See Definitions and Examples »

Test Your Vocabulary

Dog Words Quiz

  • shiba puppy more or less demanding cuddles
  • Which of the following animals has a dog in its etymology?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play
Ask the Editors
Word Games