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    I'm doing an experiment using a bubble raft to model crystal defects in metals.

    The lab script says "by assuming the surface to be the (111) plane of a fcc lattice, label the 3 important directions".

    So, it looks something like this (with hexagonal packing of the atoms):

    o o o o o o o o o o o o o
    -o o o o o o o o o o o o o
    o o o o o o o o o o o o o
    -o o o o o o o o o o o o o
    o o o o o o o o o o o o o
    -o o o o o o o o o o o o o

    But I have no idea what the three important directions are

    Any help would be appreciated.
    Thanks.
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    think about what directions planes of atoms might possibly slide over each other.
    Horizontal is one. There are another two.
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    Ah I see!
    Thank you.
 
 
 
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