greisen

[ grahy-zuhn ]

noun

1. a hydrothermally altered rock of granitic texture composed chiefly of quartz and mica, common in the tin mines of Europe.

greisen

/ ˈɡraɪzən /

noun

1. a light-coloured metamorphic rock consisting mainly of quartz, white mica, and topaz formed by the pneumatolysis of granite

Word History and Origins

Origin of greisen¹

Borrowed into English from German around 1875–80

Word History and Origins

Origin of greisen¹

C19: from German, from greissen to split

Example Sentences

Greisen occurs typically in belts or veins intersecting granite.

From Project Gutenberg

Greisen is closely connected with schorl rock both in its mineralogical composition and in its mode of origin.

From Project Gutenberg