Palagonite


Also found in: Dictionary, Wikipedia.
Related to Palagonite: Palagonite tuff

palagonite

[pə′lag·ə‚nīt]
(geology)
A brown to yellow altered basaltic glass found as interstitial material or amygdules in pillow lavas.
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 It might be outdated or ideologically biased.

Palagonite

 

a glassy mineral substance of yellow-brown, brownish green, or dark brown color, having a high water content and sometimes occurring in partially devitrified form. It is found in basalts and in diorites and their tuffs. Palagonite contains 13 to 23 percent water, 37 to 40 percent silica, and 12 to 21 percent iron oxides. The most common form of palagonite is found near the city of Palagonia (hence the name) in Sicily and also in Iceland, Franz Josef Land, the Bol’shezemel’skaia Tundra, and the Timan Ridge.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
3) occurs as irregular veinlets, disseminations, and small isolated pods in highly altered palagonite tuff of the Goulette Brook Formation (Rose and Johnson 1990).
These textural criteria--which include recognition and interpretation of "pit-textures," "sponge-textures," and "zoned palagonite"--can be easily and rapidly applied to a large number of samples for qualitative initial screenings and surveys, but they cannot provide definitive evidence of specific microbial activity in the crust.
The explosions create a glassy material known as palagonite, an excellent source of dark, sand-size material, he adds.