[8][11] Another requirement for the lamellar separation is very slow cooling of the rock that contains the plagioclase. Labradorite ((Ca,Na)(Al,Si)4O8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. 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. Drag2 - Resize Labradorite belongs to the triclinic crystal system. Spectrolite is often cut as a lapidary cabochon, similar to plain labradorite, to enhance the effect and is used as a gemstone. 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. Hardness: 6-6.5. Some specimens of sunstone are labradorite. Outcrops of basaltic lava flows are easily susceptible to mechanical and chemical weathering by penetration of groundwater along the polygonal joints (Fig. { Labradorite is also considered as constitution of medium silica, and poor silica igneous rocks, and metamorphic rocks, The formations of labradorite are also known to occur in several rocks types such as gabbro, basalt, diorite, amphibolite, and andesite. Define-se geralmente como tendo "%An" entre 50 e 70. Chemical Formula Na(30-50%)Ca(70-50%)(Al,Si)AlSi Chemical Formula: SiO 2 Color: Light Blue. 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. A - Atoms On/Off Labradorite is similar to these minerals: Bytownite, Andesine, Plagioclase and more. Originally described from Marmato Mine, Marmato, Cauca, Chocó Department, Colombia. if (gAutoPrint) { Yellows, gold,reds, and purple are some of the other colors shown by specimens of labradorite. Uncommon member of the humite group, a magnesium silicate according to the chemical formula 9 (SiO 4 ) 4 (F,OH) 2. It is a variety of the well known mineral feldspar. It can be seen as perfect cleavages and uneven to conchoidal fractures as physical properties. Contributions to the understanding of the origin and cause of the effect were made by Robert Strutt, 4th Baron Rayleigh (1923), and by Bøggild (1924). Keyboard [2] 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. Its name is derived from the Labrador Peninsula in Canada, where the stone was first found in … Name From the occurrence at Fo 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. Labradorite is a feldspar mineral of the plagioclase series that is most often found in mafic igneous rocks such as basalt, gabbro, and norite. Refractive Index: 1.559 - 1.570. Its chemical name is zirconium silicate and its corresponding chemical formula is ZrSiO4 Mogok, Burma. Its iridescent coloring ranges from yellow-orange to blue-green when moved around under light. if (headTags.length > 0) 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. Its beautiful schiller (or play of light) gives an outward indication of its ability to help us to look within and self-reflect. The uncommon anorthosite bodies are composed almost entirely of labradorite. { 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 It has an anorthite percentage (%An) of between 50 and 70. Labradorite is one of the best stones to use when dealing with any type of addiction or to break unhealthy (physical, mental, etc) habits. This play of color is known as the “Schiller Effect” by gemologists. It is noted for its beautiful play of color which flashes out over large areas of the grey-colored mineral. var headTags = document.getElementsByTagName("head"); Español Displaying brilliant pastels and deep golden colors, phenomenal labradorite features a spellbinding "black rainbow" of color. Hardness 6. Some stones have a greater labradorescence effect then others, and a greater play of color increases the value of the Labradorite. São frequentes os cristais maclados. Granular - Generally occurs as anhedral to subhedral crystals in matrix. It is noted for its beautiful play of color which flashes out over large areas of the grey-colored mineral. urchinTracker(); Print or Cut-and-Paste your Labradorite Specimen Label here : Labradorite is a feldspar mineral with chemical formula (Ca,Na)(Al,Si)4O8. The refractive index ranges from 1.559 to 1.573 and twinning is common. S - Stereo Pair on/off } var gAutoPrint = true; // Flag for whether or not to automatically call the print function Scale: Picture size 3x3 cm. Yellows, gold,reds, and purple are some of the other colors shown by specimens of labradorite. It has also been reported in Norway, Finland and various other locations worldwide, with notable distribution in Madagascar, China, Australia, Slovakia and the USA. Help on Above. Labradorite stone is a member of the albite family and stone of Uranus planet. Blue Lace Agate, as it is known, is usually banded in layers of light blue, bright blue stripes, and threads of brown. Colors: Grey, brown, green, reddish, rarely colorless. Characterised … Popularity of this gemstone is a proof of its effectiveness. Chemical Formula: (Na,Ca)(Si,Al)4O8 : Composition: Molecular Weight = 270.77 gm Sodium 4.25 % Na 5.72 % Na 2 O ... Labradorite Plagioclase. Crystalline - Coarse - Occurs as well-formed coarse sized crystals. You can find the explanation on the plagioclase feldspar page. printWin.print(); Streak nearly colorless. Labradorite | #Geology #GeologyPage #Minerals Chemical Formula: (Ca,Na)[Al(Al,Si)Si2O8] Locality: Labrador peninsula, Canada. Labradorite displaying this effect is rare to find. The formula can be thought of as four olivine (Mg 2 SiO 4 ), plus one brucite (Mg(OH) 2 ). Learn more about the Labradorite meaning here! F - Fit to Screen Chemical Formula (Ca,Na)(Al,Si) Structure Triclinic. 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 specific gravity ranges from 2.68 to 2.72. It has an anorthite percentage (%An) of between 50 and 70. Uses of Labradorite . Labradorite is now a sought-after gemstone. P - Polyhedra On/Off An intermediate member of the Albite-Anorthite Series. This triclinic mineral can display an iridescent optical effect (or schiller) known as labradorescence. Some stones have a greater labradorescence effect then others, and a greater play of color increases the value of the Labradorite. Chemical Composition: (Ca,Na) (Si,Al) 4 O 8, Sodium present can be (30-50%) and Calcium present can be (70-50%). This play of color is known as the “Schiller Effect” by gemologists. Warning: this large pop-up is very compute intensive and Labradorite is named after the Canadian province of Labrador, the classic locality of this gemstone. Labradorite is a member of the Feldspar group. Mineral Discussion Forum from Fabre Minerals - also available in Color: Dark grey to grey-black, with colorful iridescence. 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. Ask about Labradorite here : Chemical Formula: (Ca,Na)[Al(Al,Si)Si 2 O 8] Locality: Labrador peninsula, Canada. 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. html += '\n\n\n'; var html = '\n\n'; The other end member, Anorthite, contains calcium and no sodium. Its iridescent coloring ranges from yellow-orange to blue-green when moved around under light. Labradorite - Color, Facts, Power, Mythology, History And Myths. It has an anorthite percentage (%An) of between 50 and 70. 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: Labradorite can aid in communicating with our highest self and with the creator. 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. 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%. According to native Canadian tribal lore, Labradorite contains the Northern Lights, known as the Aurora Borealis. Labradorite is a mineral that has the chemical formula of (NaCa) 2 Si 2 O 8. It is a variety of the well known mineral feldspar. Andesine-Labradorite is a beautiful crystalline gem that is a combination of two feldspar varieties: andesine and labradorite. 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. Density: 2.65 - 2.75. Hardness: 6-6.5. Colors: Grey, brown, green, reddish, rarely colorless. 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. Labradorite is an intermediary member of this series. 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. In thin section, plagioclase feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). Its name "andesine" refers to the Andes Mountains where andesine was first found and the name "labradorite" was derived from Labrador, Canada, where labradorite … Labradorite is often heavily flawed with internal dark lines and streaks; stones that are clean of flaws are rare. html += headTags[0].innerHTML; Oct 10, 2014 - Chemical Formula: (Ca,Na)[Al(Al,Si)Si2O8] Locality: Labrador peninsula, Canada. 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. "); Chemical Formula: NaAlASi3O8 to CaAl2Si2O8 Sodium calcium aluminum silicate. 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. Cleavage: Perfect. This triclinic mineral can display an iridescent optical effect (or schiller) known as labradorescence. Labradorite is a feldspar mineral with the chemical formula (Ca, Na)(Al, Si)4O8. Rockhounds Discussion Group on Yahoo Groups Streak nearly colorless. Labradorite is a mineral in the plagioclase series, and it shares many of the properties of plagioclase minerals. drag2 - RMB Resize/Rotate 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 a mineral that has the chemical formula of (NaCa) 2 Si 2 O 8. The chemical formula for Labradorite is considered to be determined as (Na, Ca), Al 1-2, Si 3, o8. Its chemical formula is (Ca, Na)(Al, Si) 4 O 8, where Ca/(Ca + Na) (% anorthite) is between 30–50%. 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 Drag1 - Manipulate Crystal Labradorite has many meanings and effects of superior healing power. A variety of Albite A plagioclase feldspar with an albite : anorthite molar ratio ranging from 50 : 50 to 70 : 30. function printSpecial() Labradorite PDF WM. Chemical geodynamics in a back arc region around the Sea of Japan: implications for the genesis of alkaline basalts in Japan, Korea, and China. Labradorite is a plagioclase feldspar. Labradorite is a member of the Feldspar group. Colorless, Gray, Gray white, White, Light green. Name Origin: Named after its locality. Crystals are commonly twinned after Albite, Pericline, and Carlsbad laws. Name Origin: Named after its locality. 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: The geological type area for labradorite is Paul Island near the town of Nain in Labrador, Canada. Labradorite belongs to the triclinic crystal system. Chemical Formula: (Ca,Na)[Al(Al,Si)Si 2 O 8] Locality: Labrador peninsula, Canada. And its chemical composition is as follows: (Na,Ca)(Al,Si) 4 O 8 with Na (30-50%) and Ca (70-50%). Labradorite ((Ca, Na) (Al, Si) 4 O 8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. It is also found in anorthosite, an igneous rock in which labradorite can be the most abundant mineral. The term labradorescence was coined by Ove Balthasar Bøggild, who defined it (labradorization) as follows:[5]. alert("Could not find the printReady section in the HTML"); 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. Albite is one member, containing sodium and no calcium. 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: Topic. 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 … Common mineral associates in igneous rocks include olivine, pyroxenes, amphiboles and magnetite. A plagioclase feldspar with an albite : anorthite molar ratio ranging from 30 : 70 to 50 : 50. Some gemstone varieties of labradorite exhibiting a high degree of labradorescence are called spectrolite. printWin.document.close(); Also colorless, orange-red and brownish. Labradorite is also known for a good healing gemstone that can refrain from negative feelings. 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