Share this entry

greisen Syllabification: grei·sen
Pronunciation: /ˈɡrīzən/

Definition of greisen in English:


A light-colored rock containing quartz, mica, and fluorine-rich minerals, resulting from the alteration of granite by hot vapor from magma.
Example sentences
  • A greisen is a quartz - mica aggregate containing significant amounts of cassiterite, wolframite, fluorite, topaz, rutile, and tourmaline.
  • It has been collected in a road cut near Grant Mills, Cumberland, Rhode Island; in Stratford, Fairfield County, Connecticut; and in greisen with purple fluorite at Irish Creek, Rockbridge County, Virginia.
  • Eventually we reached the site, a few trenches along veins of greisen.


Late 19th century: from German, probably a dialect word, from greis 'gray with age'.

Words that rhyme with greisen

bedizen, horizon, kaizen

Definition of greisen in:

Share this entry


What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day innocuous
Pronunciation: iˈnäkyo͞oəs
not harmful or offensive