plagioclase feldspar

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Related to plagioclase feldspar: anorthite, alkali feldspar, mica

plagioclase feldspar

(plā`jēəklās'): see feldsparfeldspar
or felspar
, an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron, calcium, or barium or combinations of these elements.
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"The surprise discovery of this work is that in lunar rocks, even in nominally water-free minerals such as plagioclase feldspar, the water content can be detected," said Zhang.

Traces of water detected on moon's oldest rocks

This explains the high ratio of plagioclase feldspar as well as the subordinate grains identified in Table 1.

Movement of ideas not materials: locally manufactured pottery on Mabuyag Island, Western Torres Strait

The detrial feldspars are mainly plagioclase feldspar with lesser amount of potash feldspar.

Petrography of sandstones of Thekopili Formation, Jaintia Hills district, Meghalaya

The latter comprise plagioclase feldspar, alkali feldspar, quartz, and amphibole that has almost all altered to biotite mica.

Goddesses, snake tubes, and plaques: analysis of ceramic ritual objects from the LM IIIC shrine at Kavousi

Microprobe analysis of several plagioclase feldspar inclusions in each of the sherds revealed the presence of unusually high K-feldspars.

The Murray Islands archaeological project: results of recent archaeological analyses

Partition of Sr, Ba, Ca, Y, E[u.sup.2+], E[u.sup.3+] and other REE between plagioclase feldspar and magmatic liquid: an experimental study.

A petrochemical study of basaltic layering at Henley Harbour, Labrador, using multidimensional scaling

3) contain relatively higher amounts of low K plagioclase feldspar which will only make a small contribution to available K.

The forms of potassium and potassium adsorption in some virgin soils from south-western Australia

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