• 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. This was first shown by the German mineralogist Johann Friedrich Christian Hessel (1796–1872) in 1826.
  • 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: 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 ...
  • Wisconsin Geological & Natural History Survey » Plagioclase

    wgnhs.wisc.edu/minerals/plagioclase — Plagioclase is an abundant component of the Dunbar Gneiss, forming megacrysts up to 2 cm. long associated with K feldspar, biotite and quartz. It is well-exposed as augen gneiss in the SE NW sec. 36 T.38N. R.18E. (Sims et al., 1992). — Plagioclase is abundant in the Marinette Quartz Diorite with quartz and biotite.
  • Plagioclase - Eve Wiki, the Eve Online wiki - Guides ...

    eve.fandom.com/wiki/Plagioclase Plagioclase is not amongst the most valuable ore types around, but it has the largest amount of Pyerite of any ore and is thus always in constant demand. It also yields some Tritanium and Mexallon. It has a volume of 0.35m3, and it requires 333 ore units to refine. There are two variants: 1 Azure Plagioclase 2 Rich Plagioclase 3 Mining 4 Refining 5 Links Azure Plagioclase was made infamous in ...
  • Plagioclase Feldspar | Physical-Optical Properties ...

    geologyscience.com/minerals/plagioclase-feldspar Plagioclase minerals are important constituents of many metamorphic rocks, such as gneiss, where they can be inherited from an igneous protolith or formed during the regional metamorphism of sedimentary rocks. Plagioclase is a common clast produced during the weathering of igneous and metamorphic rocks.
  • Plagioclase Mineral Data

    www.webmineral.com/data/Plagioclase.shtml Plagioclase Labradorite. Comments: Dual view of a cleavage fragment of labradorite showing the multi-colored labradorescence (schiller effect) and the same area viewed without the color.The color is due to optical interference on Bøggild exsolution lamellae. Location: Ihosy, Betroka district, Toliara Province, Madagascar.Scale: Picture size 3x3 cm. ...
  • 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 - UND

    sites.und.edu/dexter.perkins/opticalmin/plagioclase.htm Plagioclase and Augite in a Diabase. The photos above show mostly labradorite (a variety of plagioclase) with several grains of augite (a variety of clinopyroxene).The labradorite is clear and the augite has a typical dusty geen-gray color in PP light.. The plagioclase exhibits well developed albite twins, giving a zebra-striped appearance in XP light.