greisen - meaning and definition. What is greisen
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What (who) is greisen - definition

HIGHLY ALTERED GRANITIC ROCK OR PEGMATITE
Greisening
  • [[Thin section]] of greisen containing fluorite (black), from the [[Ore Mountains]]
  • Dark greisen veins of [[cassiterite]] and [[arsenopyrite]] in granite, Ore Mountains (Erzgebirge)
  • Granite (light) with sheeted veins of greisen (dark) at Cligga Head, [[Cornwall]]

Greisen         
·noun A crystalline rock consisting of quarts and mica, common in the tin regions of Cornwall and Saxony.
greisen         
['gr??z(?)n]
¦ noun Geology a light-coloured rock resulting from the alteration of granite by hot vapour from magma.
Origin
C19: from Ger., prob. a dialect word, from greis 'grey with age'.
Greisen         
Greisen is a highly altered granitic rock or pegmatite, usually composed predominantly of quartz and micas (mostly muscovite). Greisen is formed by self-generated alteration of a granite and is a class of moderate- to high-temperature magmatic-hydrothermal alteration related to the late-stage release of volatiles dissolved in a magma during the solidification of that magma.

Wikipedia

Greisen

Greisen is a highly altered granitic rock or pegmatite, usually composed predominantly of quartz and micas (mostly muscovite). Greisen is formed by self-generated alteration of a granite and is a class of moderate- to high-temperature magmatic-hydrothermal alteration related to the late-stage release of volatiles dissolved in a magma during the solidification of that magma.

Greisens are usually variably altered rocks, grading from coarse, crystalline granite, commonly vuggy with miarolitic cavities, through to quartz and muscovite rich rocks, which may be locally rich in topaz, tourmaline, cassiterite, fluorite, beryl, wolframite, siderite, molybdenite and other sulfide minerals, and other accessory minerals. They may occur as small to large veins, or large zones in the roof of some granites. The rocks can sometimes be mined as ores of tin and other minerals.

Examples of use of greisen
1. In a message, Mr Troy Greisen, Managing Director, Special Olympics Asia Pacific, said, «With each and every event in various corners of the world we strive to help raise awareness and draw much deserved attention towards need for action by society at large for inclusion of people with intellectual disability.