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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Ishita Das posted an Question
November 11, 2020 • 13:19 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
13. which of the following statement is/are true reqardinq dioctahedral britte mica 0 a) it has trivalent cation in octahedral spaces b) it has 3 out of 3 octah
13. Which of the following statement is/are true reqardinq dioctahedral britte mica 0 a) It has Trivalent Cation in Octahedral spaces b) It has 3 out of 3 octahedral spaces filled C) It includes Margarite, Clintonite d) It has more Silicon than Aluminum in Tetraahedral site
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Owishi Sarkar
Correct answer will be option a). Dioctahedral micas generally have 2 trivalent cations in the octahedral site. Micas with interlayer cation of charge more than 1 are called brittle micas. Margarite is a dioctahedral brittle mica but clintonite is a trioctahedral brittle mica. And regarding option d it is not necessary that Si will be more in tetrahedral site like for example Margarite CaAl2(Al2Si2)O10(OH)2 which has same number of Al and Si in tetrahedral site. So, the only correct option is a)
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Sajan sarthak Best Answer
Brittle mica:- Micas with interlayer cation of charge more than one are called brittle mica. Dioctahedral micas generally have 2 trivalent site, i.e octahedral site. option a is the answer