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Lecture - 6 Crystallography and Optical Properties

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Uploaded by on Jul 3, 2008

Lecture Series on Engineering Geology by Prof.Debasis Roy, Department of Civil Engineering,I.I.T.Kharagpur.For more Courses visit http://nptel.iitm.ac.in

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  • the sound of this lecture in not good

  • tnx but can you be a little faster next time!

  • yeah i ve already watched all of those for years now

  • @mysciencenow : Well, also for those, I'd recommend the lecture by Bernhardt Wuensch, which is also available on youtube and on the website of MIT. That one's much better...if not brilliant!

  • it s not perfect but it will do for people who dont know anything...

  • ganda

  • thank you i'm taking mineral and energy resources this semester

  • I'm sorry to say this: it's faulty, so please, feel encouraged to learn more, but don't believe, what's said. Examples:

    - isometric (cubic) system: no centre of symmetry is necessary. Pointgroup -43m isn't centrosymmetric, two independent 3-folds are sufficient for the cubic system.

    - tetragonal: One axis is different in length, yes; but not essentially longer...

    - orthorhomic: "at least one 2-fold"? No, sorry, MORE than one 2-fold symmetry is needed ...

    This is, where I stopped watching.

    Ash

  • VERY NICE LECTURE

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