| 释义 |
Definition of greisen in English: greisennoun ˈɡrʌɪz(ə)nˈɡrīzən mass nounGeology A light-coloured rock containing quartz, mica, and fluorine-rich minerals, resulting from the alteration of granite by hot vapour from magma. 〔地质〕云英岩 Example sentencesExamples - Eventually we reached the site, a few trenches along veins of greisen.
- 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.
OriginLate 19th century: from German, probably a dialect word, from greis 'grey with age'. Definition of greisen in US English: greisennounˈɡrīzən Geology A light-colored rock containing quartz, mica, and fluorine-rich minerals, resulting from the alteration of granite by hot vapor from magma. 〔地质〕云英岩 Example sentencesExamples - Eventually we reached the site, a few trenches along veins of greisen.
- 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.
OriginLate 19th century: from German, probably a dialect word, from greis ‘gray with age’. |