One of the mysteries of the English language finally explained.
A light-colored rock containing quartz, mica, and fluorine-rich minerals, resulting from the alteration of granite by hot vapor from magma.
- ‘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’.
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