Mindat.org's Discussion Groups The specific gravity ranges from 2.71 to 2.74. (The third direction is poor.) Crystals are rare, to 2 cm; commonly massive, cleavable, or granular. Name From the occurrence at Fo Crystals are commonly twinned after Albite, Pericline, and Carlsbad laws. var printReadyElem = document.getElementById("printReady"); Labradorite is a feldspar mineral with chemical formula (Ca,Na)(Al,Si)4O8. Labradorite was first identified at P (2) Color: Labradorite is known for its labradorence because of the wonderful luminous colors it holds.You can often see, rainbow-like blues, yellows, greens, reds, and oranges. if (gAutoPrint) H - Help Screen Crystal Structure: Triclinic; platy, prismatic. Labradorite can attend to both stress and depression and thus be a great physical healing benefit. Chemical Formula (Ca,Na)(Al,Si) Structure Triclinic. 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. Andesine-Labradorite Chemistry & Crystallography Chemical Name calcium or sodium silicate Chemical Formula NaAlSi 3 O 8 or CaAl 2 Si 2 O 8: Crystal System Triclinic Chemistry Classification Silicate Hardness: 6-6.5. Its beautiful schiller (or play of light) gives an outward indication of its ability to help us to look within and self-reflect. Biaxial (+), a=1.554-1.563, b=1.5588-1.5675, g=1.562-1.573, bire=0.0080-0.0100, 2V(Calc)=78-86, 2V(Meas)=85. Labradorite is also known for a good healing gemstone that can refrain from negative feelings. Chemical Formula: Labradorite is a mid-composition plagioclase feldspar Labradorite ranges from 30% to 50% NaAlSi 3 O 8 and 70% to 50% CaAl 2 Si 2 O 8. 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: Being a cooling stone, it has a soft, soothing elegance that is used to cure insomnia, promote strength and healing, and ensure a healthy life. Labradorite belongs to the triclinic crystal system. RMB - Cycle Display Modes The term labradorescence was coined by Ove Balthasar Bøggild, who defined it (labradorization) as follows:[5]. S - Stereo Pair on/off The chemical formula for Labradorite is considered to be determined as (Na, Ca), Al 1-2, Si 3, o8. Labradorite is a plagioclase feldspar, intermediate between albite and anorthite.. Albite is one member, containing sodium and no calcium. Labradorite Crystal gets its name from the town of Labrador, Canada, where the stone was discovered. alert("Sorry, the print ready feature is only available in modern browsers. [4] It also is found in metamorphic amphibolites and as a detrital component of some sediments. urchinTracker(); Print or Cut-and-Paste your Labradorite Specimen Label here : This triclinic mineral can display an iridescent optical effect (or schiller) known as labradorescence. 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. [2] 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). Dbl Clk - Start-Stop Rotation Labradorite stone is a member of the albite family and stone of Uranus planet. Labradorite is now a sought-after gemstone. It is a variety of the well known mineral feldspar. Originally found at Ford Harbour, Paul Island, near Nain, off the east coast of Labrador, Newfoundland and Labrador [56° 30' N, 61° 30' W]. Warning: this large pop-up is very compute intensive and Granular - Generally occurs as anhedral to subhedral crystals in matrix. Ask about Labradorite here : Basically an unusual mineral, Labradorite exhibits the vibrant presentation of various colors that are caused due to the internal fractures that the stone has, which displays the light back and forth giving the view that the stone is playing with the array of colors that it contains. Labradorite, a feldspar mineral in the plagioclase series that is often valued as a gemstone and as ornamental material for its red, blue, or green iridescence.The mineral is usually gray or brown to black and need not be iridescent; when used as a gem it is usually cut en cabochon (with a rounded convex surface). Labradorite belongs to the Plagioclase Feldspar group, an isomorphous solid solution series. Labradorite | #Geology #GeologyPage #Minerals Chemical Formula: (Ca,Na)[Al(Al,Si)Si2O8] Locality: Labrador peninsula, Canada. { Español var headTags = document.getElementsByTagName("head"); } Labradorite ((Ca, Na)(Al, Si)4O8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. Labradorite is often heavily flawed with internal dark lines and streaks; stones that are clean of flaws are rare. Chemical geodynamics in a back arc region around the Sea of Japan: implications for the genesis of alkaline basalts in Japan, Korea, and China. Yellows, gold,reds, and purple are some of the other colors shown by specimens of labradorite. The formula may be written as Na 0.7-0.5 Ca 0.3-0.5 Al 1.3-1.5 Si 2.7-2.5 O 8. if (document.getElementById != null) São frequentes os cristais maclados. In thin section, plagioclase feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). The color is due to optical interference on Bøggild exsolution lamellae. The other end member, Anorthite, contains calcium and no sodium. Its chemical name is zirconium silicate and its corresponding chemical formula is ZrSiO4 Mogok, Burma. Labradorite is a feldspar mineral with chemical formula (Ca,Na)(Al,Si)4O8. Its iridescent coloring ranges from yellow-orange to blue-green when moved around under light. Plagioclase minerals frequently exhibit twinning and striations on cleavage faces. Labradorite belongs to the Plagioclase Feldspar group, an isomorphous solid solution series. Labradorite is an intermediary member of this series. printWin.print(); Labradorite is a mineral that has the chemical formula of (NaCa) 2 Si 2 O 8. The geological type area for labradorite is Paul Island near the town of Nain in Labrador, Canada. Labradorite is a mineral that has the chemical formula of (NaCa) 2 Si 2 O 8. Labradorite Mineral Facts: Chemical Formula: 1NaAlSi 3 0 8 to 3CaAl 2 Si 2 0 8 Intermediate between albite and anorthite corresponding chiefly to one quarter albite and three quarters anorthite. Transparency: Transparent to opaque Chemical Formula Na(30-50%)Ca(70-50%)(Al,Si)AlSi Outcrops of basaltic lava flows are easily susceptible to mechanical and chemical weathering by penetration of groundwater along the polygonal joints (Fig. if (headTags.length > 0) drag1 - LMB Manipulate Structure Keyboard Chemical Formula: (Ca,Na)[Al(Al,Si)Si 2 O 8] Locality: Labrador peninsula, Canada. M - Menu It has also been reported in Norway, Finland and various other locations worldwide, with notable distribution in Madagascar, China, Australia, Slovakia and the USA. Labradorite may be best known for the opaque variety with a color play of iridescent colors that includes blues, greens, gold, orange, yellow and purple. Labradorite is a feldspar mineral with the chemical formula (Ca, Na)(Al, Si)4O8. It occurs as clear, white to gray, blocky to lath shaped grains in common mafic igneous rocks such as basalt and gabbro, as well as in anorthosites. _uacct = "UA-3067463-1"; 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. Although Labradorite is a selection of Anorthite, it is, in reality, a combination of Albite and Anorthite … The lamellar separation only occurs in plagioclases of a certain composition; those of calcic labradorite and bytownite (anorthite content of ~60 to 90%) particularly exemplify this. Hardness: 6-6.5. Andesine-Labradorite is a beautiful crystalline gem that is a combination of two feldspar varieties: andesine and labradorite. Labradorite was named for where it was discovered, Labrador, Canada. It helps to assists when facing and navigating all types of changes and challenges, attracting strength and perseverance. Labradorite belongs to plagioclase feldspars family. if (document.getElementsByTagName != null) Define-se geralmente como tendo "%An" entre 50 e 70. Many of the gemstone lovers have Labradorite. LABRADORITE PHYSICAL PROPERTIES. Some stones have a greater labradorescence effect then others, and a greater play of color increases the value of the Labradorite. Labradorite is classified as a plagioclase feldspar with the chemical formula (Ca,Na)[Al(Al,Si)Si 2 O 8]. var printWin = window.open("","printSpecial", 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width=350,height=350'); The cause of this optical phenomenon is lamellar structure caused by an exsolution process due to a miscibility gap. if (printReadyElem != null) This play of color is known as the “Schiller Effect” by gemologists. A - Atoms On/Off It has an anorthite percentage (%An) of between 50 and 70. You can find the explanation on the plagioclase feldspar page. Albite is one member, containing sodium and no calcium. printWin.document.write(html); Labradorite Chemical composition: the composition of the intermediate members of the plagioclase solid solution series are expressed in terms of the two pure end members of this series, albite (NaAlSi 3 O 8) and anorthite (CaAl 2 Si 2 O 8).Using this methodology, the composition of labradorite is thus expressed as Ab 50-30% An 50-70%. Its best known feature is its beauty, being a very colorful stone with colors ranging from yellow to green, green to blue, to even more. Chemical Formula: (Na,Ca)(Si,Al)4O8 : Composition: Molecular Weight = 270.77 gm Sodium 4.25 % Na 5.72 % Na 2 O ... Labradorite Plagioclase. Original Rockhounds Discussion Group { } Its best known feature is its beauty, being a very colorful stone with colors ranging from yellow to green, green to blue, to even more. function printSpecial() Labradorite PDF WM. 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 Slow cooling is required to allow the Ca, Na, Si, and Al ions to diffuse through the plagioclase and produce the lamellar separation. html += '\n\n\n'; return; And its chemical composition is as follows: (Na,Ca)(Al,Si) 4 O 8 with Na (30-50%) and Ca (70-50%). Streak nearly colorless. printWin.document.open(); { © Dave Barthelmy, Mouse alert("Could not find the printReady section in the HTML"); Physical Properties of Labradorite: Chemical Formula: (Ca,Na)Al 1-2 Si 3-2 O 8: Chemical Composition: Sodium calcium aluminum silicate: Crystal System: Triclinic: Lustre: Vitreous to pearly: Transparency: Transparent to translucent: Colour: White, Gray, Blue, Light Green, Pale Orange-Red, Black: Streak: White: Hardness: 6 - 6.5 on Mohs Scale: Tenacity: Brittle: Cleavage: The specific gravity ranges from 2.68 to 2.72. Common mineral associates in igneous rocks include olivine, pyroxenes, amphiboles and magnetite. It is noted for its beautiful play of color which flashes out over large areas of the grey-colored mineral. Labradorite displaying this effect is rare to find. Labradorite is a plagioclase feldspar. 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. [1], Labradorite can display an iridescent optical effect (or schiller) known as labradorescence. Labradorite ((Ca,Na)[Al printWin.document.close(); Labradorite is often heavily flawed with internal dark lines and streaks; stones that are clean of flaws are rare. Colour: Usually pale grey-blue to dark grey, green-brown to black. The specific gravity ranges from 2.68 to 2.72. A plagioclase feldspar with an albite : anorthite molar ratio ranging from 30 : 70 to 50 : 50. Sunstone is a plagioclase gemstone in which tiny platelets of copper or another mineral are arranged in a common orientation. Uncommon member of the humite group, a magnesium silicate according to the chemical formula 9 (SiO 4 ) 4 (F,OH) 2. B - Bonds On/Off Its name "andesine" refers to the Andes Mountains where andesine was first found and the name "labradorite" was derived from Labrador, Canada, where labradorite … Scale: Picture size 3x3 cm. Help on Above, Wenk H R , Joswig W , Tagai T , Korekawa M , Smith B K , American Mineralogist , 65 (1980) p.81-95, The average structure of An 62-66 labradorite, Surtsey x-ray, feldspar. The stone helps you adopt a similar perspective on life. Labradorite ((Ca,Na)(Al,Si)4O8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. Help on Above. The specific gravity ranges from 2.68 to 2.72. Labradorite displaying this effect is rare to find. drag2 - RMB Resize/Rotate Its iridescent coloring ranges from yellow-orange to blue-green when moved around under light. This triclinic mineral can display an iridescent optical effect (or schiller) known as labradorescence. In addition, Labradorite is thought to be of great help to the respiratory system, the metabolic and digestive system, symptoms of PMS and rheumatism, arthritis and gout as … } Colorless, Gray, Gray white, White, Light green. The formula can be thought of as four olivine (Mg 2 SiO 4 ), plus one brucite (Mg(OH) 2 ). [8][11] Another requirement for the lamellar separation is very slow cooling of the rock that contains the plagioclase. Chemical Composition: (Ca,Na) (Si,Al) 4 O 8, Sodium present can be (30-50%) and Calcium present can be (70-50%). Uses of Labradorite . Labradorite Meaning - At Energy Muse, our crystals and stones such as the Labradorite have the ability to release mental, physical, and spiritual blockages. Labradorite ((Ca, Na) (Al, Si) 4 O 8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. Chemical Formula: (Na,Ca)Al 1-2 Si 3-2 O 8. Drag2 - Resize Its chemical formula is (Ca, Na)(Al, Si) 4 O 8, where Ca/(Ca + Na) (% anorthite) is between 30–50%. And its chemical composition is as follows: (Na,Ca)(Al,Si) 4 O 8 with Na (30-50%) and Ca (70-50%). } Labradorite is a feldspar mineral with the chemical formula (Ca, Na)(Al, Si)4O8. Keyboard Also colorless, orange-red and brownish. may not work well with some computers. Labradorite is now a sought-after gemstone. }, a = 8.155, b = 12.84, c = 10.16, Z = 6; alpha = 93.5°, beta = 116.25°, gamma = 89.133° V = 952.25 Den(Calc)= 2.84, {001} Perfect, {010} Good, {110} Distinct. Rockhounds Discussion Group on Yahoo Groups Chemical Formula (Ca,Na)(Al,Si) Structure Triclinic. Labradorite is one of the best stones to use when dealing with any type of addiction or to break unhealthy (physical, mental, etc) habits. Name Origin: Named after its locality.Labradorite ((Ca,Na)[Al(Al,Si)Si 2 O 8 ]), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. It can be seen as perfect cleavages and uneven to conchoidal fractures as physical properties. It is also found in anorthosite, an igneous rock in which labradorite can be the most abundant mineral. Labradorite ((Ca,Na)(Al,Si) 4 O 8), é um mineral do grupo dos feldspatos, sendo um dos membros cálcicos intermédios da série da plagioclase. It can be seen as perfect cleavages and uneven to conchoidal fractures as physical properties. Name Origin: Named after its locality. This play of color is known as the “Schiller Effect” by gemologists. else Hardness 6. Hardness 6. Colors: Grey, brown, green, reddish, rarely colorless. It is a variety of the well known mineral feldspar. Originally described from Marmato Mine, Marmato, Cauca, Chocó Department, Colombia. The refractive index ranges from 1.559 to 1.573 and twinning is common. Streak nearly colorless. Chemical Formula: SiO 2 Color: Light Blue. { It has a Mohs hardness of about 6 to 6 1/2 and two distinct directions of cleavage that intersect at an angle of about 86 degrees or 94 degrees. Yellows, gold,reds, and purple are some of the other colors shown by specimens of 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. What makes it particularly attractive as a gemstone is that many specimens show a unique play of color. Spectrolite is often cut as a lapidary cabochon, similar to plain labradorite, to enhance the effect and is used as a gemstone. 58 Carat Azure Flash Labradorite Pendant Natural Feldspar Mineral Freeform Spectrolite Crystal Polished Stone Specimen - Madagascar: Amazon.ca: Home & Kitchen 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: Labradorite ((Ca,Na)[Al These platelets produce a reflective flash when incident light enters the stone at a proper angle relative … Mineral Name: Labradorite . ... Labradorite is a multi-dimensional mineral, working on both the physical and the etheric bodies. In thin section, plagioclase feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). P - Polyhedra On/Off Learn more about the Labradorite meaning here! The phenomenal variety that shows labradorescence is the best-known variety, but rainbow moonstone, Oregon sunstone, and transparent yellow labradorite are also labradorite feldspars. Labradorite has many meanings and effects of superior healing power. I - Indicies Labradorite is named after the Canadian province of Labrador, the classic locality of this gemstone. Journal of Geophysical Research: Solid … O indíce de refracção varia de 1.555 a 1.575. A variety of Albite A plagioclase feldspar with an albite : anorthite molar ratio ranging from 50 : 50 to 70 : 30. It has an anorthite percentage (%An) of between 50 and 70. Spectrolite - Trade name for a Labradorite from Finland that shows the spectral colours especially effectively. html += headTags[0].innerHTML; { Uses of Labradorite . Labradorite is a member of the Plagioclase Feldspars of the Feldspar Group of minerals that also includes Albite, Amazonite, Andesine, Anorthite, Bytownite, Hyalophane, Labradorite, Moonstone, Oligoclase, Orthoclase, Sanidine and Sunstone. Displaying brilliant pastels and deep golden colors, phenomenal labradorite features a spellbinding "black rainbow" of color. Mouse else Labradorite belongs to the Plagioclase Feldspar group, an isomorphous solid solution series. Characterised … Physical Properties of Labradorite: Chemical Formula: (Ca,Na)Al 1-2 Si 3-2 O 8: Chemical Composition: Sodium calcium aluminum silicate: Crystal System: Triclinic: Lustre: Vitreous to pearly: Transparency: Transparent to translucent: Colour: White, Gray, Blue, Light Green, Pale Orange-Red, Black: Streak: White: Hardness: 6 - 6.5 on Mohs Scale: Tenacity: Brittle: Cleavage: An intermediate member of the Albite-Anorthite Series. Popularity of this gemstone is a proof of its effectiveness. Labradorite is a plagioclase feldspar, intermediate between albite and anorthite.. It is noted for its beautiful play of color which flashes out over large areas of the grey-colored mineral. } Please use it when you are down or stressed out. The effect is visible when the lamellar separation is between 128 to 252 nm. [9] The effect is visible when the lamellar separation is between 128 to 252 nm (5.0×10−6 to 9.9×10−6 in); the lamellae are not necessarily parallel;[9] and the lamellar structure is found to lack long range order.[10]. Color: Dark grey to grey-black, with colorful iridescence.
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