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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References in periodicals archive ?
"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.
This explains the high ratio of plagioclase feldspar as well as the subordinate grains identified in Table 1.
The detrial feldspars are mainly plagioclase feldspar with lesser amount of potash feldspar.
The latter comprise plagioclase feldspar, alkali feldspar, quartz, and amphibole that has almost all altered to biotite mica.
Microprobe analysis of several plagioclase feldspar inclusions in each of the sherds revealed the presence of unusually high K-feldspars.
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.
3) contain relatively higher amounts of low K plagioclase feldspar which will only make a small contribution to available K.