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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
November 23, 2020 • 16:31 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
C is the right ans. sir can you elaborate this, also with respect to other options
In the biaxial mineral crystallizing is the Monoclinic system the ab plane contains the X and Z optical directions al/x and c//z b axis is parallel to the optical direction Y all of the above are correct
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Rahul kumar Best Answer
In monoclinic crystals, only one (conventionally b axis) of the principal vibration directions will coincide with a crystallographic axis. The others (a and c axis) will be at some angle to the crystallographic axes. In simple words, for monoclinic crystals: a and c axis is not parallel to the principal vibration direction whereas b is parallel to vibration direction Y. For triclinic crystals: None of the crystallographic axis is parallel to the principal vibration direction.