Definition of greisen in English:

greisen

Line breaks: grei|sen
Pronunciation: /ˈgrʌɪz(ə)n
 
/

noun

[mass noun] Geology
  • A light-coloured rock containing quartz, mica, and fluorine-rich minerals, resulting from the alteration of granite by hot vapour from magma.
    More 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.

Origin

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

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