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Feldspar
Member of the Plagioclase feldspar labradorite seldom forms crystals but when crystals do occur they are tabular. Most often occurs in crystalline masses that can be microscopic or up to a yard and is commonly characterized by it's SCHILLER effect. This is a rich play of iridescent colors principal blue but also an array of colors.
Anorthite belongs to the Plagioclase Feldspar group, an isomorphous solid solution series. Albite is one end member, containing sodium and no calcium. The other end member, Anorthite, contains calcium and no sodium. The intermediary members are Oligoclase, Andesine, Labradorite, and Bytownite.Labradorite and Bytownite are considered by some to be a variety .
Plagioclase and Augite in a Basalt. The photos above show abundant plagioclase lathes (clear - PP; low order interference colors - XP) and the clinopyroxene augite (almost clear- PP; 2nd order yellow to blue to pink interference colors-XP) in a matrix that contains a lot of brown glass.Two vesicles are also present (clear, PP; isotropic, XP) -- one left of center on the bottom edge, .
Labradorite is an unusual mineral. It can display a beautiful iridescent play of colors, caused by internal fractures in the mineral that reflect light back and forth, dispersing it into different colors. This effect, known as labradorescence, gives Labradorite its appeal and fame.Specimens sold to collectors are usually polished or sliced by dealers to fully bring out this effect.
Andesine Feldspar comes from the Plagioclase group of Feldspar that is found in many locations around the world. It measures 6 – 6.5 on the MOHS scale making it a little bit soft but still durable. This semi precious gemstone can be found as a beautiful clear yellow stone, or as a vibrant red and green stone with small inclusions causing the ...
plagioclase feldspars - Ca-Na alkali feldspars - Na-K in common usage, the terms alkali feldspar and K- feldspar are used interchangeably. Plagioclase Feldspar Physical Color.
The most important gem member of the plagioclase group is labradorite, the chief attraction of which is its change of color that may be visible at one angle across the entire surface of the stone. This effect is created by light interference set up by thin plates of feldspar that result from repeated twinning.
Aug 28, 2019· The key difference between orthoclase and plagioclase is that orthoclase appears in green-yellow colour, whereas plagioclase appears in white colour.. Orthoclase and plagioclase are important minerals.Both these forms are members of the feldspar group. A feldspar mineral is an abundant rock-forming mineral typically occurring as colourless or pale-coloured crystals.
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).
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.
Oligoclase is a high sodium feldspar crystallizing in the triclinic system. The Mohs hardness is 6 to 6.5 and the specific gravity is 2.64 to 2.66. The refractive indices are: nα=1.533–1.543, nβ=1.537–1.548, and nγ=1.542–1.552. In color it is usually white, with shades of grey, green, or red.
Pure feldspar, free of exsolution, is colorless. However, minor chemical substituents, inclusions, interference effects from exsolution lamellae, and radiation damage can produce color in the mineral. Chemical impurities produce the yellow color of sanidine, orthoclase and calcic plagioclase, the blue to green colors of amazonite, and the blue-green color of sodic plagioclase.
Plagioclase is feldspar that contains "sodium (Na)" and "calcium (Ca)". When it contains a lot of sodium, it is called "Albite". If calcium does, it is called "Anorthite". When it is in the middle of "Albite" and "Anorthite", it becomes "Labradorite". The appearances also change greatly depending on the ingredients.
Hematite (specular) Magnetite Quartz (amethyst) Plagioclase Feldspar Sphalerite Luster (M/NM) M Color Sitter White Hardness (1-10) 3,5-4 Cleavage/Fracture Crystal Form Isometric Streak Specific Gravity white to pole Darkgray forms mishappens Diagnostic Properties Hetrahedrols fordrodecahaters Chemical Group ZnS Ione of zine for bross Uses Galatoned nails steel and .
Orthoclase (K-feldspar): Porcelain luster; commonly colored pink, white, or gray. Cleavage in 2 directions at right angles may be detected by a reflection of light when specimen is rotated. Plagioclase: Usually gray or white in granite, dark-bluish color in gabbro. Striations common. 2 cleavage directions at right angle may be detected.
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.
Feldspar can also be chemically zoned. Plagioclase feldspar grows in igneous environments and crystals which grow early in a cooling magma contain more calcium than those formed at the end of crystallization, which are enriched in sodium. This is predicted by the Bowen's Reaction Series.
Similarly the combination of albite twinning and pericline twinning in alkali feldspar results when high temperature sanidine (monoclinic) transforms to low temperature microcline (triclinic). This type of twinning is only observed using the polarizing microscope, and results in a "tartan" twinning pattern as shown in your text book on page 231 ...
Oligoclase belongs to the Plagioclase Feldspar group, an isomorphous solid solution series. Albite is one member, containing sodium and no calcium. The other end member, Anorthite, contains calcium and no sodium.Oligoclase is an intermediary member of this series. Oligoclase is considered by some authorities as a variety of Albite rather than a separate mineral.
feldspar species is an important factor in igneous rock classification. Feldspars are also important constituents of many metamorphic rocks and are found in some sedimentary rocks, especially sandstones. Some plagioclase feldspars will have one composition in the interior of the crystal, and a gradually or sharply changing composition toward ...
May 30, 2020· INTRODUCTION. Plagioclase feldspar is the most abundant rock‐forming mineral in the crust of solid planetary bodies, including Earth, and represents up to 70% of the Moon's crust (e.g., Papike et al. 1991).Despite the abundance of plagioclase, studies of its response to shock metamorphism are limited in comparison to those of quartz or olivine (e.g., .
The plagioclase feldspar with an iridescent play-of-color that is often used as a gemstone. Author: Hobart M. King, Ph.D., GIA Graduate Gemologist Labradorite: Photograph of labradorite gemstones exhibiting a beautiful labradorescent play of iridescent colors.
plagioclase is white and quartz vermicules are gray. Discussion The colors in the photomicrographs (Figs. 1-3, 5) are not the fluorescent colors of K, Ca, or Na because these elements do not fluoresce with these colors. The colors represent fluorescence of trace elements associated with the K, Ca, and Na in the feldspars.
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