iddingsite

[′id·iŋ‚zīt]

(mineralogy)

A reddish-brown mixture of silicates, forming patches in basic igneous rocks.

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References in periodicals archive ?

D'Antonio and Kristensen (2005) analysed the secondary minerals generated by hydrothermal alteration affecting the basalts of oceanic crust in the West Philippine Sea Basin and recorded clay minerals, mostly glauconite, minor Al-saponite and Fe-beidellite, together with iddingsite, Ca-Na zeolites and calcite.

Glauconitic laminated crusts from hydrothermal alteration of Jurassic pillow-lavas (Betic Cordillera, S Spain): a microbial influence case

Composition measurements of the Y000593 spherules show that they are significantly enriched in carbon compared to the nearby surrounding iddingsite layers.

Life On Mars? Evidence of Water in Meteorite

The olivine is partially to completely replaced by antigorite and iddingsite and the orthopyroxene is generally replaced by antigorite, bastite and chlorite.

The olivine (Fo92-94) is partially to completely replaced by antigorite or occasionally altered to iddingsite. Chrysotile veinlets generally cross cut the groundmass.

Petrology of the mantle rocks from the Muslim Bagh Ophiolite, Balochistan, Pakistan

Moreover, its phenocrystal unity is a compound of plagioclase, kaersutite, iddingsite olivine minerals.

Glazed stones: Enver Guner introduces the concept of glazed stones

Iddingsite, calcite, serpentine, and zeolite are the main secondary minerals.

Olivine is mostly fresh, but in some cases it is altered to iddingsite and/or serpentine.

Multiphase alkaline basalts of central Al-Haruj Al-Abyad of Libya: petrological and geochemical aspects

Alteration of both phenocrysts and groundmass is also evident in most sections, with olivine partly or totally altered to iddingsite, and plagioclase weathering to clay minerals.

Learning the lithic landscape: using raw material sources to investigate pleistocene colonisation in the Ivane Valley, Papua New Guinea

Olivine occurs in nearly ail cumulates as sub- to anhedral grains, and is partly altered to serpentine or iddingsite. In more evolved cumulates, clinopyroxene is modally abundant, and is generally partly altered to green amphibole.

The origin of mafic-ultramafic bodies within the northern Dashwoods Subzone, Newfoundland Appalachians

The latter minerals are surrounded by red iddingsite rims (samples no.

New age and petrological constraints on Lower Silesian basaltoids, SW Poland

Swindle of the University of Arizona in Tucson and his colleagues, contains an abundance of iddingsite, a mixture of clays and iron oxides that forms only in the presence of water.