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Definition of Greisen
1. Noun. A granitic rock composed of quartz and mica. 
Definition of Greisen
1. n. A crystalline rock consisting of quarts and mica, common in the tin regions of Cornwall and Saxony.
Definition of Greisen
1. Noun. (geology) A highly altered granitic rock containing quartz and mica ¹
¹ Source: wiktionary.com
Definition of Greisen
1. a type of rock [n -S]
Medical Definition of Greisen
1. 



