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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
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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