"); The geological type area for labradorite is Paul Island near the town of Nain in Labrador, Canada. Striated - Parallel lines on crystal surface or cleavage face. 2.1) and fractures, loosening and decaying the rock layer by layer.The surface of weathering grows more and more rounded as the process progresses into blocks resembling spheroidal shape on a larger scale. Labradorite is similar to these minerals: Bytownite, Andesine, Plagioclase and more. Labradorite is a plagioclase feldspar, intermediate between albite and anorthite.. Chemical Composition: (Ca,Na) (Si,Al) 4 O 8, Sodium present can be (30-50%) and Calcium present can be (70-50%). Labradorite belongs to plagioclase feldspars family. General Plagioclase Information : Chemical Formula: (Na,Ca)(Si,Al)4O8 : Composition: Molecular Weight = 270.77 gm Sodium 4.25 % Na 5.72 % Na 2 O: Calcium 7.40 % Ca 10.36 % CaO: Aluminum 9.96 % Al 18.83 % Al 2 O 3: Silicon 31.12 % Si 66.57 % SiO 2: Oxygen 47.27 % O: 100.00 % 101.48 % = TOTAL OXIDE Common mineral associates in igneous rocks include olivine, pyroxenes, amphiboles and magnetite. Originally found at Ford Harbour, Paul Island, near Nain, off the east coast of Labrador, Newfoundland and Labrador [56° 30' N, 61° 30' W]. The formula can be thought of as four olivine (Mg 2 SiO 4 ), plus one brucite (Mg(OH) 2 ). Chemical Formula: (Na,Ca)(Si,Al)4O8 : Composition: Molecular Weight = 268.62 gm Sodium 5.14 % Na 6.92 % Na 2 O Calcium 5.97 % Ca 8.35 % CaO Aluminum 14.06 % Al 26.57 % Al 2 O 3 Silicon 27.18 % Si 58.16 % SiO 2 Oxygen 47.65 % O _____ _____ 100.00 % 100.00 % = TOTAL OXIDE: Empirical Formula: Na 0.6 Ca 0.4 Al 1.4 Si 2.6 O 8: Environment: Uses of Labradorite . Labradorite is often heavily flawed with internal dark lines and streaks; stones that are clean of flaws are rare. Refractive Index: 1.559 - 1.570. Labradorite is one of the best stones to use when dealing with any type of addiction or to break unhealthy (physical, mental, etc) habits. It has also been reported in Norway, Finland and various other locations worldwide, with notable distribution in Madagascar, China, Australia, Slovakia and the USA. var headTags = document.getElementsByTagName("head"); if (document.getElementById != null) Labradorite is a member of the Feldspar group. The streak is white, like most silicates. function printSpecial() Labradorite ((Ca,Na)[Al Labradorite is now a sought-after gemstone. Andesine-Labradorite is a beautiful crystalline gem that is a combination of two feldspar varieties: andesine and labradorite. O peso específico varia de 2.71 a 2.74. The term labradorescence was coined by Ove Balthasar Bøggild, who defined it (labradorization) as follows:[5]. Mouse Slow cooling is required to allow the Ca, Na, Si, and Al ions to diffuse through the plagioclase and produce the lamellar separation. Characterised … Chemical Formula: (Ca,Na)[Al(Al,Si)Si 2 O 8] Locality: Labrador peninsula, Canada. The streak is white, like most silicates. Comments: Dual view of a cleavage fragment of labradorite showing the multi-colored labradorescence (schiller effect) and the same area viewed without the color. It has an anorthite percentage (%An) of between 50 and 70. printWin.document.close(); It can be seen as perfect cleavages and uneven to conchoidal fractures as physical properties. Chemical Formula Na(30-50%)Ca(70-50%)(Al,Si)AlSi Hardness: 6 - 6.5 on the Mohs scale. Polished labradorite from UCL Geology collections, Hurlbut, Cornelius S.; Klein, Cornelis; Manual of Mineralogy, Wiley, 1985, 20th ed., p. 456, "On the Labradorization of the Feldspars", "The structure of labradorite and the origin of its iridescence", "Exsolution lamellar structure causes of iridescence in labradorite: evidence from TEM", "Relation Between Labradorescence and Internal Structure of Labradorite", https://en.wikipedia.org/w/index.php?title=Labradorite&oldid=987924317, Provincial symbols of Newfoundland and Labrador, Articles with dead external links from February 2020, Articles with permanently dead external links, Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference, Creative Commons Attribution-ShareAlike License, Gray, gray-white, brown, greenish, pale green, blue, yellow, colorless, Crystals typically thin and tabular, rhombic in cross section, striated; massive, Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}, This page was last edited on 10 November 2020, at 01:26. Some specimens of sunstone are labradorite. Its chemical name is zirconium silicate and its corresponding chemical formula is ZrSiO4 Mogok, Burma. Spectrolite is often cut as a lapidary cabochon, similar to plain labradorite, to enhance the effect and is used as a gemstone. Albite is one member, containing sodium and no calcium. Colors: Grey, brown, green, reddish, rarely colorless. Warning: this large pop-up is very compute intensive and } RMB - Cycle Display Modes H - Help Screen Labradorite is a mineral that has the chemical formula of (NaCa) 2 Si 2 O 8. General Labradorite Information : Chemical Formula: (Ca,Na)(Si,Al)4O8 : Composition: Molecular Weight = 271.81 gm Sodium 3.38 % Na 4.56 % Na 2 O Calcium 8.85 % Ca 12.38 % CaO Aluminum 15.88 % Al 30.01 % Al 2 O 3 Silicon 24.80 % Si 53.05 % SiO 2 Oxygen 47.09 % O _____ _____ 100.00 % 100.00 % = TOTAL OXIDE: Empirical Formula: if (headTags.length > 0) Its iridescent coloring ranges from yellow-orange to blue-green when moved around under light. Name From the occurrence at Fo Crystals are rare, to 2 cm; commonly massive, cleavable, or granular. [8][11] Another requirement for the lamellar separation is very slow cooling of the rock that contains the plagioclase. © Dave Barthelmy, Mouse Crystal System: Triclinic. Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. Labradorization is the peculiar reflection of the light from submicroscopical planes orientated in one direction (rarely in two directions); these planes have never such a position that they can be expressed by simple indices, and they are not directly visible under the microscope. It is also found in anorthosite, an igneous rock in which labradorite can be the most abundant mineral. B - Bonds On/Off Mineral Discussion Forum from Fabre Minerals - also available in { Location: Ihosy, Betroka district, Toliara Province, Madagascar. You can find the explanation on the plagioclase feldspar page. O indíce de refracção varia de 1.555 a 1.575. Ask-A-Mineralogist from the Mineralogical Society of America Labradorite PDF WM. Therefore, not all labradorites exhibit labradorescence (they might not be the correct composition and/or they cooled too quickly), and not all plagioclases that exhibit labradorescence are labradorites (they may be bytownite). Original Rockhounds Discussion Group Crystal Structure: Triclinic; platy, prismatic. The cause of this optical phenomenon is lamellar structure caused by an exsolution process due to a miscibility gap. Originally described from Marmato Mine, Marmato, Cauca, Chocó Department, Colombia. The stone helps you adopt a similar perspective on life. It helps to assists when facing and navigating all types of changes and challenges, attracting strength and perseverance. Labradorite can attend to both stress and depression and thus be a great physical healing benefit. This formula shows that there can be some variation in the relative proportions of calcium and sodium, and aluminum and silica, and still be classified as labradorite. may not work well with some computers. Granular - Generally occurs as anhedral to subhedral crystals in matrix. Labradorite displaying this effect is rare to find. The color is due to optical interference on Bøggild exsolution lamellae. Labradorite is also known for a good healing gemstone that can refrain from negative feelings. 58 Carat Azure Flash Labradorite Pendant Natural Feldspar Mineral Freeform Spectrolite Crystal Polished Stone Specimen - Madagascar: Amazon.ca: Home & Kitchen Define-se geralmente como tendo "%An" entre 50 e 70. Yellows, gold,reds, and purple are some of the other colors shown by specimens of labradorite. Oct 10, 2014 - Chemical Formula: (Ca,Na)[Al(Al,Si)Si2O8] Locality: Labrador peninsula, Canada. Journal of Geophysical Research: Solid … Yellows, gold,reds, and purple are some of the other colors shown by specimens of labradorite. Colors: Grey, brown, green, reddish, rarely colorless. As with all plagioclase members, the crystal system is triclinic, and three directions of cleavage are present, two of which are nearly at right angles and are more obvious, being of good to perfect quality. [5][6][7], The cause of this optical phenomenon is phase exsolution lamellar structure,[8] occurring in the Bøggild miscibility gap. Labradorite (Feldspar) Labradorite is a variety of Anorthite which is a known person in the plagioclase Feldspars of the Feldspar number of minerals that features Albite, Amazonite, Andesine, Anorthite, Bytownite, Hyalophane, Labradorite, Moonstone, Oligoclase, Orthoclase, Sanidine, and Sunstone. P - Polyhedra On/Off urchinTracker(); Print or Cut-and-Paste your Labradorite Specimen Label here : Labradorite PDF WM. Chemical Formula: SiO 2 Color: Light Blue. Chemical Formula: (Na,Ca) 8 [(S,Cl,SO 4,OH) 2 |(Al 6 Si 6 O 24)] Color: Deep Azure Blue Lazurite is known to promote an understanding of truth and intuitive abilities. Carlsbad laws Na 0.7-0.5 Ca 0.3-0.5 Al 1.3-1.5 Si 2.7-2.5 O 8 refrain from feelings! From Marmato Mine, Marmato, Cauca, Chocó Department, Colombia amphiboles and magnetite an igneous in. 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