Amber Richhariya posted an Question
October 17, 2021 • 17:42 pm 30 points
  • IIT JAM
  • Geology (GG)

An analysis of augite yields 2 silicate atoms calculated on the basis of 12 oxygen atoms . if al replaces si , calculate the number of tetrahedral - al in the

An analysis of augite yields 2 silicate atoms calculated on the basis of 12 oxygen atoms . If Al replaces Si , calculate the number of tetrahedral - Al in the mineral ?

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    Saurabh 1

    It's all about the valency difference between the Si and Al . You might be aware of the fact that Valency of Si is 4+ Valency of Al is 3+ As per question 2 silicate atoms are present in tha augite per 12 oxygen atoms. So total valency= 2×4 = 8 (Valency of Si is 4) While as per given question, only Al replaces Si atoms. So Si will definitely be replaced by 2 Al atoms which contributed towards the valency of 2×3=6 (valency of Al is 3) . Remaining sites will be acquired by Al, so number of tetrahedral Al is 2. Note: This one seems to be quite irrelevant. Do check the question again and let me know in case of any correction or confusion.

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