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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
December 26, 2020 • 22:53 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
26. in anorthosite, the feldspar dominantly present 1s a anorthite b. labradorite d. microc line c. sandine 47. the strongly pleochroic mineral is: a. quartz c.
26. In anorthosite, the feldspar dominantly present 1s A Anorthite B. Labradorite D. Microc line C. Sandine 47. The strongly pleochroic mineral is: A. Quartz C. Orthoclase B. Hornblende D. Muscovite
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Rahul kumar Best Answer
Q26: Anorthite Anorthite is the dominant plagioclase feldspar in Anorthosite rock. Q47: Hornblende Hornblende is strongly Pleochroic mineral. Hornblende shows light green to dark green and pale brown color pleochroism. Muscovite, Orthoclase and Quartz are colourless minerals i.e. don't show pleochroism.
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Saurabh 1
26) Anorthosite is a typical monomineralic rock composed of around 90% anorthitic plagioclase or rich in labradorite.... 27)It has to B... Hornblende occur in different shades when mineral in thin section is rotated under plane polarised light... Muscovite, orthoclase and quartz are generally colour less and do not show much pleochroism (or generally absent in case of orthoclase and muscovite).
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Dear Gurmeet, kindly mark this answer if it is correct.... Thanks..
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Sajan sarthak![best-answer]()
26.Anorthosite is having greater than 90 percentage Calcic plagioclase. In moon 🌝 the major rock is Anorthosite. so Anorthite definitely 47.Hornblende strongly pleochroic.