• Plagioclase - Wikipedia

    en.wikipedia.org/wiki/Plagioclase Plagioclase is a series of tectosilicate (framework silicate) minerals within the feldspar group. Rather than referring to a particular mineral with a specific chemical composition, plagioclase is a continuous solid solution series, more properly known as the plagioclase feldspar series (from the Ancient Greek for "oblique fracture", in reference to its two cleavage angles).
  • plagioclase | Definition, Uses, & Facts | Britannica

    www.britannica.com/science/plagioclase Plagioclase, any member of the series of abundant feldspar minerals usually occurring as light-colored, glassy, transparent to translucent, brittle crystals. Plagioclase is a mixture of albite, or sodium aluminosilicate, and anorthite, or calcium aluminosilicate.
  • Plagioclase Feldspar: A group of common rock-forming minerals

    geology.com/minerals/plagioclase.shtml What is Plagioclase? “Plagioclase” is the name of a group of feldspar minerals that form a solid solution series ranging from pure albite, Na(AlSi 3 O 8), to pure anorthite, Ca(Al 2 Si 2 O 8).Minerals in this series are a homogenous mixture of albite and anorthite. The names of the minerals in the series are arbitrarily given based upon their relative abundance of albite and anorthite.
  • Plagioclase | Definition of Plagioclase at Dictionary.com

    www.dictionary.com/browse/plagioclase Plagioclase definition, any of the feldspar minerals varying in composition from acidic albite, NaAlSi3O8, to basic anorthite, CaAl2Si2O8, found in most igneous rocks: shows twinning striations on good cleavage surfaces. See more.
  • Plagioclase: The mineral Plagioclase information and pictures

    www.minerals.net/mineral/plagioclase.aspx The Plagioclase series is a group of related feldspar minerals that essentially have the same formula but vary in their percentage of sodium and calcium. Albite and Anorthite are the end members of the series, with the intermediary minerals Oligoclase, Andesine, Labradorite, and Bytownite. The acclaimed Dana's System of Mineralogy lists the intermediary members as individual minerals, whereas ...
  • Plagioclase - definition of plagioclase by The Free Dictionary

    www.thefreedictionary.com/plagioclase plagioclase (ˈpleɪdʒɪəʊˌkleɪz) n (Minerals) a series of feldspar minerals consisting of a mixture of sodium and calcium aluminium silicates in triclinic crystalline form: includes albite, oligoclase, and labradorite plagioclastic adj pla•gi•o•clase (ˈpleɪ dʒi əˌkleɪs) n. any of the feldspar minerals varying in composition from albite ...
  • Plagioclase

    flexiblelearning.auckland.ac.nz/rocks_minerals/minerals/plagioclase.html Plagioclase Plagioclase is a member of the feldspar group (like orthoclase) and is a framework silicate.Plagioclase consists of a solid solution between the albite and anorthite end-members, and together with quartz is the most common of the rock forming minerals. The twinning in plagioclase produces stacks of twin layers that are typically fractions to several millimetres thick.
  • Plagioclase - an overview | ScienceDirect Topics

    www.sciencedirect.com/topics/earth-and-planetary-sciences/plagioclase Plagioclase contains significant amounts of an anorthite component. Oligoclase is the minimum requirement, typical is andesine or labradorite. Greenschist Facies. In the greenschist facies mafic rocks contain actinolite and albite. Actinolite is an Al-poor amphibole; it contains mainly tremolite. Actinolite is green in hand specimen and ...
  • University of Minnesota’s Mineral Pages: Plagioclase Feldspar

    www.esci.umn.edu/courses/1001/minerals/plagioclase_feldspar.shtml Plagioclase minerals are hard, non-metallic minerals that exhibit two cleavage directions that meet at nearly right angles. The name ‘plagioclase’ refers to this cleavage pattern, coming from the Greek words for ‘oblique’ (plagios) and ‘to break’ (klasis).Apart from pegmatites, the plagioclase minerals seldom occur as well-defined isolated crystals, but instead occur as blocky to ...
  • Plagioclase definition and meaning | Collins English ...

    www.collinsdictionary.com/dictionary/english/plagioclase Plagioclase definition: a series of feldspar minerals consisting of a mixture of sodium and calcium aluminium... | Meaning, pronunciation, translations and examples