plagioclase

IPA: pɫˈeɪdʒiʌkɫeɪs

(mineralogy) Any of a group of aluminum silicate feldspathic minerals ranging in their ratio of calcium to sodium.

Examples of "plagioclase" in Sentences

Albite is a plagioclase feldspar mineral.
Calcic plagioclase is stable to 25 km depth.
(Feldspar) plagioclase, alkali-feldspar (H 6-6. 5)
Plagioclase is an abundant mineral in the Earth's crust.
Restite feldspars will typically be a sodic plagioclase.
This was not sufficient to convert plagioclase to albite.
Anorthite is a rare compositional variety of plagioclase.
Anorthite is the calcium endmember of plagioclase feldspar.
Albite is considered both a plagioclase and alkali feldspar.
I was staring a Ca-rich plagioclase and pyroxenes and ilmentite.
The groundmass of these rocks is composed of plagioclase and quartz.
Cumulate gabbros are more properly termed pyroxene plagioclase orthocumulate.
The minerals included in this group are orthoclase, microcline, and the plagioclase feldspars.
Of course plagioclase feldspars are also one of my favorites so I might be a little partial here.
These rocks are composed predominantly of the minerals plagioclase feldspar, amphibole, and pyroxene.
Most of the larger oxides and plagioclase are interstitial, having grown in the intercumulus pore spaces.
I found a moonstone (the plagioclase feldspar oligocase) almost as big as my fist, almost perfectly round.
All of these rock types are light in color because of the dominance of quartz, potassium and sodium feldspars, and plagioclase feldspar minerals (Figure 1).