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KIC004414 - S Part 2 Orthosilicates These minerals are...

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Unformatted text preview: S Part 2 Orthosilicates: These minerals are somewhat different from one another so they should be easy to distinguish but this may not be the case when you start with an unknown specimen. The possible minerals include andalusite, kyanite, sillimanite, and sphene (also called titanite). Identify the dominant orthosilicate in each slide, list the critical observation(s) that brought you to this conclusion, sketch an example of the mineral, and state in which type of rock(s) the mineral is usually found. l4 k\w_nti_¢ I Mom; at u-vvé - L .,;, “tr-sun. ”M“ “And-q ’ 90“:ch . Co/or/(rs' w. ft); ‘Elmoqlcg .La‘ba ~ “‘94 m (p . [51,“; (Ht) /7 t I le’Lfi/ (it"IlT/Itf’tq X (7 L 6W? aria 4m P / I 69x17 (Box 3) You are looking at the aggregates of fibrous crystals (not anything with bird’s eye extinction): g I 1 i, ”A r :4 46K -, a— " ’ f M - raw"; "\ \N‘cpk T‘AL [luaaxnndhf‘ SkliH ,SM :15 -’ “"le I‘llx‘F 'Sccau‘l ardu‘ 3’1], (d/if‘f; 0 Fefa/é/ (zr‘mcléah . in: 70'»! deal/9L .16” ( may!“ 9” mm“ 69x13 (E0): 4): The dominant mineral in the slide. (Hint: It is being replaced by the phyllosilicate you observed above in the same thin section). An dd M4 #6 uFDnngL .n pugkLGDl/J- rfic'ol" .krgk ”Jud: - (ekfl‘kfié " ”P1. .In/ucrr-s 9/ thrk ”I‘M!“ "MHfi/ (hum! ctr/under: (0M cam. ...
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