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Dibydibyaranjan posted an Question
May 20, 2020 • 12:22 pm 30 points
  • IIT JAM
  • Geology (GG)

Euhedral or anhedral ! do they hold their meaning same both in thin section and megascopic or not?

euhedral or anhedral ! do they hold their meaning same both in thin section and megascopic or not?

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    Rahul kumar

    Dear student, please mark the question as answered if I was able to clear your doubts.

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    Rahul kumar

    Euhedral means crystal/grain having well shaped edges and faces. Euhedral and anhedral is quite different when you look in thin section and in hand specimen. In case of thin section, you look at the grain size scale and on the basis of shape of a grain you decide whether that grain is euhedral or anhedral. On the other hand when you look at any hand specimen (megascopic) hou look at the aggregates of grains i.e. final crystal form and on the basis of overall shape of the crystal (aggregates of grains), you decide whether the hand specimen is euhedral or anhedral. In short, euhedral and anhedral in case of thin section recognised at grain size scale and in case of hand specimen (megascopic), it decipher the overall shape of any crystal.

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    Sajan sarthak Best Answer

    Basically euhedral means perfect grain boundaries are seen under microscope. and anhedral means no grain boundary perfectly developed all are fused. and if you are considering about megascopic hand specimen you will find a good growing crystal in external form if considering a single mineral.. and in rocks all grain shapes are fused so difficult to understand the hedral things. ultimately you have to make them thin sections to see the grain boundaries.

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    in which temperature condition euhedral and anhedral crystal are formed??

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    and which factors are responsible for euhedral or anhedral growth??

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    good nucleation site is highly required for euhedral growth

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