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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
K.asish Subudhi posted an Question
August 16, 2021 • 16:03 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
2. the difference in number of faces in forms hk 1) and {11) in the holosymmetric class of the isometric system is (a) 40 (b) 43 (c) 48 (d) 20
2. The difference in number of faces in forms hk 1) and {11) in the holosymmetric class of the isometric system is (A) 40 (B) 43 (C) 48 (D) 20
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Saurabh 1 Best Answer
I think there's a mistake in the question. In place of {hk1} it should be {hkl}. {hkl} is the general symbol of hexoctahedron. and number of faces in hexoctahedron is equal to = 48 . While for {111}, belongs to octahedron has faves equal to = 8. So difference is = 48-8 = 40. So correct option is A. Note: Kindly go through the various forms (basically closed forms) of isometric crystal system. And do note down the number of faces present in each one of them and the form symbol pertaining to that specific form. Also {hk1} is basically included in {hkl} and {hk1} is classified as pinacoids with two parallel faces.
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