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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
November 02, 2020 • 05:53 am
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30 points
30 points
- IIT JAM
- Geology (GG)
Sir what is orthodome and why the ans is not b &d
Which one of the following represents a Closed form? A Tetragonal prism B. Dihexagonal pyramid C. Orthodome D. Trigonal dipyramid (IIT-JAM 2013)
2 Answer(s)
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Sajan sarthak
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In a monoclinic crystal: a dome with faces parallel to the ortho axis is called a Orthodome. Trigonal dipyramidal 6 bar= 3/m is a closed form because volume is enclosed by this form. B is not the answer because it's Dihexagonal pyramid. if it had Dihexagonal bipyramid it would have been a closed one.
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sir crystallography kaise kru...yeh shapes toh smj hi aari muje. please suggest anything
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Perkins and Nesse book dekho sab 3D diagram ke sath he
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Agar phirbhi diagram nahi aa Raha he samaj me to Dana book dekho
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Saurabh 1![best-answer]()
Answer is (d)..Mainly dipyramids correspond to close form in crystallography. Orthodome is defined as a dome whose faces are found parallel to orthodiagonal(orthoaxis) . B cannot be the answer, as pyramid corresponds to open form in crystallography. Trigonal dipyramid belongs to Hexagonal crystal system (6bar, closed form),so is the Dihexagonal pyramid (6mm) have open face at the bottom when represented(open form). For more understanding please go through the image provided below.
but dihexagonal pyramid is close.