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  • WordNet 3.6
    • n plagioclase any of a series of triclinic feldspars that form rocks
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Webster's Revised Unabridged Dictionary
    • n Plagioclase (Min) A general term used of any triclinic feldspar. See the Note under Feldspar.
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Century Dictionary and Cyclopedia
    • n plagioclase The name given by Breithaupt to the group of triclinie feldspars the two prominent cleavagedirections in which are oblique to each other. The plagioclase-feldspar group includes albite, anorthite, and the intermediate species, oligoclase, andesin, labradorite; with these the triclinic potash feldspar microcline is sometimes included. See feldspar.
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Chambers's Twentieth Century Dictionary
    • n Plagioclase plā′ji-ō-klāz a group of triclinic feldspars whose cleavage planes are not at right angles to each other
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Webster's Revised Unabridged Dictionary
Gr. pla`gios oblique + kla^n to break
Chambers's Twentieth Century Dictionary
Gr. plagios, oblique, klasis, a fracture.


In literature:

Stillwell, who report it to be an interesting form of meteorite, containing amongst other minerals, plagioclase felspar.
"The Home of the Blizzard" by Douglas Mawson
Essentially it is a crystalline-granular compound of plagioclase, generally Labradorite and diallage.
"Volcanoes: Past and Present" by Edward Hull
More rarely biotite and augite exhibit the same relations to the plagioclase.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5" by Various
Many dolerites are porphyritic and carry phenocrysts of olivine, augite and plagioclase felspar (or of one or more of these).
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6" by Various
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2" by Various
Their essential minerals are pyroxene, plagioclase and garnet: chemically they resemble the gabbros.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3" by Various
Sometimes the striae on crystal-faces are due to repeated lamellar twinning, as in the plagioclase felspars.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7" by Various

In news:

Sunstone, the plagioclase feldspar mineral has attractive inclusions like hematite that lend a sparkly effect to the cut gemstones.