iddingsite

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Few olivine crystals can be identified in the thin section and they show oxidized rounded borders and alteration to iddingsite, suggesting that they may be xenocrysts instead of phenocrysts from the new batch of magma.

PETROGRAPHIC ANALYSIS OF THE VOLCANIC BOMBS AND BLOCKS FROM POAS VOLCANO: APRIL-JUNE 2017 ERUPTIVE PERIOD/ANALISIS PETROGRAFICO DE LAS BOMBAS Y BLOQUES VOLCANICOS DEL VOLCAN POAS: PERIODO ERUPTIVO DE ABRIL A JUNIO DE 2017

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.

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

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.

The lherzolite is composed of olivine (mostly altered to iddingsite and serpentine) enclosed by blurry clinopyroxene oikocrysts.

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

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

9 olivine phenocrysts are overgrown by red iddingsite rims.

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

Analyzing 10 samples of the meteorite by radioactive dating, the team found that the iddingsite formed between 274 and 655 million years ago.

Recent water on Mars?

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