printWin.document.write(html); By definition, Andesine must have 50 to 70 percent Sodium and 30 to 50 percent Calcium in the Sodium/Calcium crystal structure. { Its formula, however, can vary depending on the specimen. Labradorite can display an iridescent optical effect (or schiller) known as labradorescence. 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. P - Polyhedra On/Off 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 also occurs as detrital grains in sedimentary rocks. Andesine is a silicate mineral, a member of the plagioclase feldspar solid solution series. Drag1 - Manipulate Crystal M - Menu Its chemical formula is (Ca, Na)(Al, Si)4O8, where Ca/(Ca + Na) (% anorthite) is between 30–50%. } Its chemical formula is (Ca, Na)(Al, Si) 4 O 8, where Ca/(Ca + Na) (% anorthite) is between 30-50%. Location: Maeyama Ueda shi, Nagano, Japan. Labradorite ((Ca, Na)(Al, Si) 4 O 8), a feldspar mineral, is an intermediate to calcic member of the plagioclase series. Andesine is a silicate mineral, a member of the plagioclase feldspar solid solution series. But moonstone is an orthoclase feldspar while andesine is one of the plagioclase feldspars, which include oligoclase, andesine, labradorite and bytownite. Dbl Clk - Start-Stop Rotation may not work well with some computers. 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. drag2 - RMB Resize/Rotate if (document.getElementById != null) The formula may be written as Na0.7-0.5Ca0.3-0.5Al1.3-1.5Si2.7-2.5O8. [2][5], In the early 2000s, red and green gemstones began to be marketed under the name of 'andesine'. After some controversy, these gemstones were subsequently discovered to have been artificially-coloured. 195-198 ; W.D.Birch 1989. H - Help Screen Andesine can come in many colors, such as colorless, green, and yellow, though the most desired color is red. Dispersion none. It is specifically a type of the popular mineral feldspar. Often containing phenocrysts (large conspicuous crystals), Andesite is a host rock for Andesine, a precious gemstone. Andesine is a silicate mineral, a member of the plagioclase feldspar solid solution series. I - Data Info html += headTags[0].innerHTML; if (headTags.length > 0) General Andesine Information : 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: Andesine is found in a range of colours, from red, honey-red … It is commonly associated with quartz, potassium feldspar, biotite, hornblende and magnetite.[2]. 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. Andesine is a plagioclase feldspar intermediate in composition between albite and anorthite.. The streak is white, like most silicates.The refractive index ranges from 1.559 to 1.573 and twinning is common.
2020 andesine chemical formula