Ask about Andesine here : html += '\n\n'; if (headTags.length > 0) Andesine is a member of the Plagioclase Feldspar Group. Andesine is a member of the Plagioclase Feldspar Group. var gAutoPrint = true; // Flag for whether or not to automatically call the print function A majority of the Earth’s continental crust is composed of … } Andesine is a silicate mineral, a member of the plagioclase feldspar solid solution series. Labradorite can display an iridescent optical effect (or schiller) known as labradorescence. The formula may be written as Na0.7-0.5Ca0.3-0.5Al1.3-1.5Si2.7-2.5O8. Its chemical formula is (Ca, Na)(Al, Si)4O8, where Ca/(Ca + Na) (% anorthite) is between 30-50%. Link to , a = 8.155, b = 12.9, c = 9.16, Z = 6; alpha = 93.917°, beta = 116.3333°, gamma = 89.166° V = 861.52 Den(Calc)= 3.11, Transparent to Subtransparent to translucent. if (gAutoPrint) Andesine is found in a range of colours, from red, honey-red … printWin.document.open(); html += headTags[0].innerHTML; Albite is one member, containing sodium and no calcium. Comments: Translucent andesine crystal twin. The streak is white, like most silicates.The refractive index ranges from 1.559 to 1.573 and twinning is common. Español Its chemical formula is (Ca, Na)(Al, Si)4O8, where Ca/(Ca + Na) (% anorthite) is between 30–50%. Mineral Discussion Forum from Fabre Minerals - also available in alert("Sorry, the print ready feature is only available in modern browsers. may not work well with some computers. Location: Maeyama Ueda shi, Nagano, Japan. Andesine is a silicate mineral, a member of the plagioclase feldspar solid solution series. By definition, Andesine must have 50 to 70 percent Sodium and 30 to 50 percent Calcium in the Sodium/Calcium crystal structure. It is commonly associated with quartz, potassium feldspar, biotite, hornblende and magnetite.[2]. { The Australian Mineralogist No.37 March 1982 pp. F - Fit to Screen Andesine by definition must contain 70-50% sodium to 30-50% calcium in the sodium/calcium position of the crystal structure. Klein, Cornelis, and Cornelius S. Hurlbut, Jr., Tables of Gemstone Identification By Roger Dedeyne, Ivo Quintens p.118, http://www.gia.edu/gems-gemology/FA13-oregon-sunstone-pay, https://en.wikipedia.org/w/index.php?title=Andesine&oldid=940406642, Creative Commons Attribution-ShareAlike License, Crystals rare, to 2 cm; commonly massive or granular, This page was last edited on 12 February 2020, at 10:49. Drag2 - Resize html += printReadyElem.innerHTML; Its chemical formula is (Ca, Na)(Al, Si) 4 O 8, where Ca/(Ca + Na) (% anorthite) is between 30-50%. Keyboard [2][5], In the early 2000s, red and green gemstones began to be marketed under the name of 'andesine'. printWin.document.close(); [2], The plagioclase feldspars are a continuous solid solution series and as such the accurate identification of individual members requires detailed optical study, chemical analysis or density measurements. Andesite is a volcanic rock similar to basalt only lighter in color and containing less iron and magnesium than basalt. Andesine is a member of the group of minerals known as feldspars. of Minerals,2nd ed.,1990) OPTIC PROP. Help on Above. Its formula, however, can vary depending on the specimen. Rockhounds Discussion Group on Yahoo Groups A - Atoms On/Off urchinTracker(); Print or Cut-and-Paste your Andesine Specimen Label here : Its chemical formula is (Ca, Na) (Al, Si) 4 O 8, where Ca/ (Ca + Na) (% anorthite) is between 30-50%. Scale: See Photo. { 195-198 ; W.D.Birch 1989. Andesine belongs to the Plagioclase Feldspar group, an isomorphous solid solution series. { [7], Andesine occurs in intermediate igneous rocks such as diorite, syenite and andesite. printWin.print(); { The plagioclase series comprises minerals that range in chemical composition from pure NaAlSi3 O8, Albite to pure CaAl2 Si2 O8 , anorthite. After some controversy, these gemstones were subsequently discovered to have been artificially-coloured. if (printReadyElem != null) Andesine feldspar is composed of 50-70% albite and 30-50% anorthite. } Warning: this large pop-up is very compute intensive and S - Stereo Pair on/off S - Stereo (Heinrich65). Help on Above, FitzGerald J D , Parise J B , Mackinnon I D R , American Mineralogist , 71 (1986) p.1399-1408, Average structure of an An48 plagioclase from the Hogarth Ranges, Sample: Neutron data. } } H - Help Screen PROP.(Enc. Mineral Class An intermediate member of the Albite-Anorthite Series. It is a member of the plagioclase feldspar solid solution series. alert("Could not find the printReady section in the HTML"); printWin.document.write(html); See more. By definition, Andesine must have 50 to 70 percent Sodium and 30 to 50 percent Calcium in the Sodium/Calcium crystal structure. 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'); It characteristically occurs in metamorphic rocks of granulite to amphibolite facies commonly exhibiting antiperthite texture. Dbl Clk - Start-Stop Rotation if (document.getElementById != null) The plagioclase series comprises minerals that range in chemical composition from pure NaAlSi 3 O 8, Albite to pure CaAl 2 Si 2 O 8, anorthite. In thin section, plagioclase feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). Andesine is a plagioclase feldspar intermediate in composition between albite and anorthite.. Often containing phenocrysts (large conspicuous crystals), Andesite is a host rock for Andesine, a precious gemstone. Andesine definition, a mineral, intermediate in the plagioclase feldspar group, having a play of colors and usually found as crystals in igneous rocks. else Andesine is a silicate mineral, a member of the plagioclase feldspar solid solution series. Mindat.org's Discussion Groups Biaxial (+/-), a=1.543-1.554, b=1.5469-1.5587, g=1.552-1.562, bire=0.0080-0.0090, 2V(Calc)=78-84, 2V(Meas)=76-83. A variety of Anorthite A plagioclase feldspar with an albite : anorthite molar ratio ranging from 30 : 70 to 50 : 50. P - Polyhedra On/Off var headTags = document.getElementsByTagName("head"); html += '\n\n\n'; drag2 - RMB Resize/Rotate The cause of this optical phenomenon is lamellar structure caused by an exsolution process due to a miscibility gap. Refractive indices and specific gravity increase directly with calcium content. Its formula, however, can vary depending on the specimen. Andesine is a mineral with the chemical formula (NaCa)Al 2 Si 3 O 8. But moonstone is an orthoclase feldspar while andesine is one of the plagioclase feldspars, which include oligoclase, andesine, labradorite and bytownite. Andesine, Augite and Ilmenite in vesicles in an alkali olivine basalt from Portland, Victoria. _uacct = "UA-3067463-1"; Andesine was first described in 1841 for an occurrence in the Marmato mine, Colombia. It is a member of the plagioclase feldspar solid solution series. RMB - Cycle Display Modes Its chemical formula is (Ca, Na)(Al, Si)4O8, where Ca/(Ca + Na) (% anorthite) is between 30–50%. Dispersion none. }, Jeff Weissman / Photographic Guide to Mineral Species, Andes Mountains, South America. [5], Andesine was first described in 1841 for an occurrence in the Marmato mine, Marmato, Cauca, Chocó Department, Colombia. It is specifically a type of the popular mineral feldspar. [3][4] The name is for the Andes due to its abundance in the andesite lavas in those mountains. In the gemstone world, moonstone is another famous feldspar. Chemical Formula (Na,Ca)Al 1-2 Si 3-2 O 8: Color: Red, Green, Yellow, Orange, Pink, Multicolored: Hardness: 6 - 6.5: Crystal System: Triclinic: Refractive Index: 1.560 - 1.568: SG: 2.69 - 2.70: Transparency: Transparent to translucent: Double Refraction.008: Luster: Vitreous: Cleavage: 2,1 - basal ; 2,1 - prismatic ; 3,1 - pinacoidal. The other end member, Anorthite, contains calcium and no sodium.Andesine is an intermediary member of this series. { } if (document.getElementsByTagName != null) Original Rockhounds Discussion Group Mouse Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. Granular - Generally occurs as anhedral to subhedral crystals in matrix. Crystalline - Coarse - Occurs as well-formed coarse sized crystals. You can find the explanation on the plagioclase feldspar page. Andesine can come in many colors, such as colorless, green, and yellow, though the most desired color is red. Zeolites of Victoria. function printSpecial() Come in many colors, such as colorless, green, and yellow, though the most desired color red. From Portland, Victoria 7 ], andesine must have 50 to 70 sodium! ; } }, Jeff Weissman / Photographic Guide to mineral Species, Andes of! Lamellar structure caused by an exsolution process due to its abundance in the Sodium/Calcium structure! Desired color is red gemstone world, moonstone is another famous feldspar as detrital grains in sedimentary rocks ).! ) ; } }, Jeff Weissman / Photographic Guide to mineral Species, Andes mountains of America. A plagioclase feldspar solid solution series optical effect ( or schiller ) known as feldspars mineral the... Color is red Weissman / Photographic Guide to mineral Species, Andes,! 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