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KIC004432 - 17ml” TS-6(Box 4 There are two elongate...

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Unformatted text preview: 17ml” TS-6 (Box 4). There are two elongate minerals that are very similar 1n this thin section: qlr glaucophane and riebeckite. The sign of eiongation is often used to distinguish these ?15’q.pninerals from one another. GlaucOphane 15 length slow and riebeckite 15 length fast. ( 49 Using this information determine the extinction angle for each mineral Look at several ‘1" grains of each Are the extinction angles similar for these minerals or can it be used to distinguish one from the other as well? 77—4, “fitment/n nails are Immin- fiaeam fun, WAD 60"“ GIMP‘I'b'L‘é" Tia-6 WW‘J’ rib-1L be A 90911 d 'aflméJ'L" buwa'c' 4&1 {Fig 1 0 Main.“ 6 Other questions: 1) Given your understanding of the crystallographic axis, crystal symmetry, and the optic axis explain why for some minerals it will be difficult or impossible to determine the sign of elongation. flu. FWfl—lr Ifdc Fm 71—“ 9%“ M m “”4, 14' Mil Le +5 W ' $14 an ,- mm“. 3% ISO/Mn: mm.- M. ./ :2”: _, no 5744 2) Based on the observations you made today use textbook_(s) to detefleth / i | crystal system that tourmaline and kyanite belong to respectively flatmaliw’ , Lat) Szlrudcs- [5,” 0‘3 qu/ jCNia/mb/owmn {Walla = leoléfl') itclrmkulml s.lum+b‘~l9i0,.‘). {Two/Mic : 3H} ...
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