Shivam sharma Asked a Question
September 3, 2020 4:08 pmpts 30 pts
ii) Name the species of plagioclase with a chemical composition of AnAbg (3) Name the type of plagioclase compositional zoning indicated in diagrams (i), (ii) and ii). Xa Mole fraction of anorthite in plagioclase. The arrow indicates the direction of increasing AAn (9) Plagioclase ii) Fagioclase Fagiociase Core Rim Core Rim Core- Rim (ii) (11)
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  • Sajan sarthak sahoo Best Answer
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  • Sajan sarthak sahoo thankyou
    for second case i. X An is more as we go from core to rim so reversed. ii .oscillatory as mix up of An and Ab iii .normal zoning as An content decreasing as core to rim
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  • Rahul pandey
    Andesine; An40Ab60 (Means Anorthite 40% and Albite 60%) is known as Andesine (A variety of plagioclase) (i) Reverse zoning Xan (mole fraction of Anorthite is increasing towards th...
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  • Rahul pandey
    Dear student, you haven't marked this question as answered. Kindly do that. Ask me if you still have any further queries.
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