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Related to Saussurite: gabbro


A white or grayish, tough, compact mineral aggregate composed chiefly of a mixture of albite or oligoclase and zoisite or epidote.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(named after H. B. Saussure), a fine-grained aggregate of the minerals zoisite and albite, sometimes also containing calcite and sericite impurities or, less often, chlorite. Saussurite is produced by the alteration of plagioclases containing a small amount of anorthite. Particles range in size from thousandths to hundredths of a millimeter and can be distinguished only under a microscope. Most commonly, saussurite replaces plagioclases having an andesine-labradorite composition. It is formed during the metamorphosis of rocks, and is encountered most frequently in gabbros, diabases, and dolerites. The process by which plagioclases are replaced by saussurite is called saussuritization.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Groundmass is ne grained with felsophyric composition exhibits alteration to sericite, epidote, carbonates, kaolinite and saussurite etc.
Plagioclase exhibits partial or complete alteration to saussurite. In some cases the alteration is so intense that pseudomorphs after plagioclase are clearly seen.
The alteration products are mainly saussurite (i.e., fine-grained aggregate of epidote group minerals, albite, prehnite, sericite, and possibly clays).
Plagioclase is partly altered to saussurite and sericite, and pyroxene is variably altered to pale brown and pale green actinolitic amphibole, chlorite, and epidote.